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Woolino 4 Season Sleep Sack - Ultimate Merino Wool Sleeping Bag - Two-Way Zipper Adjustable Universal Size Sleep Sack for Baby (2-24 Months) - Birch Gray

4.7 out of 5 stars 4,069 ratings

Sustainability features

This product has sustainability features recognized by trusted certifications.
Safer chemicals
Made with chemicals safer for human health and the environment.
As certified by
OEKO-TEX STANDARD 100

OEKO-TEX STANDARD 100

OEKO-TEX® STANDARD 100 certified products require every component of a textiles production including all thread, buttons, and trims to be tested against a list of more than 1,000 regulated and unregulated chemicals which may be harmful to human health and the enviornment. The assessment process is globally standardized, independently conducted, and updated at least once per year based on new scientific information or regulatory requirements.

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Certification Number

23.HUS.59156

$109.00 $109.00 per count
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Purchase options and add-ons

  • 100% Merino Wool Lining / 100% Organic Cotton Outer
  • Imported
  • #1 RATED and #1 SELLING merino wool baby sleep sacks in US and Canada since 2010. Creative Child's 2018 Top Choice of the Year Award & winner of 2021 Cribsie Award and Mom's Choice Award
  • REDUCE OR ELIMINATE SLEEPLESS NIGHTS - When baby sleeps better, so do parents. PREMIUM FABRICS for best comfort: Australian merino wool lining - 100% natural, luxuriously soft, and temperature regulating. GOTS certified organic cotton outer
  • THE ONE AND ONLY sleep sack your baby will need until they turn two. UNIVERSAL SIZE: 2 months – 2 years. 4 SEASON USE: Merino wool regulates body temperature so it can be used year-round.
  • MAXIMUM VERSATILITY - double shoulder snaps and two-way zipper system for easy dressing and diaper changes; Closable seat-belt slots for easy transfer between stroller, bouncer, crib, etc. Under-arm snaps allow this wearable blanket to grow with your baby and make it the perfect swaddle transition product
  • PREMIUM QUALITY - Buy with confidence from Woolino, a trusted US company, offering US customer service and industry leading warranty for your peace of mind. The industry leader in merino wool baby essentials since 2010.

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This item: Woolino 4 Season Sleep Sack - Ultimate Merino Wool Sleeping Bag - Two-Way Zipper Adjustable Universal Size Sleep Sack for Baby (2-24 Months) - Birch Gray
$109.00 ($109.00/count)
Get it as soon as Thursday, Jul 17
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Sold by Woolino and ships from Amazon Fulfillment.
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$55.99
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Product Description

Woolino 4 Season Ultimate Sleep Bags. Sustainable fabrics. Ultimate Comfort. Naturally

Home of the 4 Season Ultimate Baby Sleep Bag

The 4 Season Ultimate Sleep Bag Grows with Baby, 4 Season use, Best Value, and Easy to Care for

Made with super soft merino wool, the 4 Season Ultimate Sleep Bag will help keep your baby at a perfect temperature all year round. That means there’s no need to worry about which sleep sack to use, or whether your baby will be too hot or cold while sleeping – they’ll always be just right!

The Benefits of Wearing Merino Wool

Natural benefits of merino wool, temp regulating & breathable, hypoallergenic, moisture wicking

100% Natural, wicking moisture away and regulating body temp, machine-washable, and an excellent value as it comes in a universal size that fits babies from 2 months to 2 years - the Woolino 4 Season Ultimate Sleep Bag is the only wearable blanket your child will need, right up until they turn two.

Features of the Ultimate Sleep Bag

The Woolino 4 Season Ultimate Baby Sleep Bag features

Perfect comfort for better sleep. Naturally.

Sleeping Baby wearing Woolino 4 Season Ultimate Baby Sleep bag in Rainbow

The Magic of Merino

Because of Merino wool's unique ability to regulate body temperature, it helps keep your baby warm when it's cold and cool when it's hot. That temperature regulation means that your child will sleep comfortably throughout the night, year-round - and that means a better night's sleep for you too.

Sleeping baby wearing Woolino 4 Season Ultimate sleep bag in Hot Air Balloon

Better and Longer Sleep

A study done by the University of Sydney has found that a better night's sleep is achieved when sleeping in wool. Merino wool is the perfect fiber to have next to your child's sensitive skin. It regulates temperature, manages moisture, is easy to care for, soft, and durable. It's naturally perfect.

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Woolino 4 Season sleeping bags or sacks made with merino wool and organic cotton

Ultimate Baby Sleep Bags

Ultimate Toddler Bags

Classic Sleep Bags

Sleep Sacks with Legs

Big Kid Sleeping Bags

Customer Reviews
4.7 out of 5 stars 4,069
4.7 out of 5 stars 1,062
4.6 out of 5 stars 1,124
4.7 out of 5 stars 698
3.8 out of 5 stars 24
Price
$109.00 $129.00 $93.00 $109.00 $149.00
Fabric
Merino Wool & Organic Cotton Merino Wool & Organic Cotton Merino Wool & Organic Cotton Merino Wool & Organic Cotton Merino Wool & Organic Cotton
Size
2 - 24 Months 2 - 4 Years 0-6 m, 6-18 m, 18-36 m 0-6 m, 6-18 m, 18-36 m, 3-4T 4 - 6 Years
Underarm Snaps to Adjust Fit
Shoulder Snaps
Safety-Belt Slots for Travel
2-Way Zipper
Replaces Loose Blankets in Bed
4-Season Use

Product information

Technical Details

Product Dimensions ‎11.81 x 9.45 x 1.97 inches
Item model number ‎BabyBeige
Is Discontinued By Manufacturer ‎No
Target gender ‎Unisex
Material Type ‎Merino wool & Organic Cotton
Care instructions ‎Machine Wash
Additional product features ‎Breathable
Number Of Items ‎1
Style ‎Transitional
Batteries required ‎No
Is portable ‎No
Item Weight ‎1.32 pounds

Additional Information

ASIN B018HV3EOC
Customer Reviews
4.7 out of 5 stars 4,069 ratings

4.7 out of 5 stars
Best Sellers Rank

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.

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Woolino 4 Season Sleep Sack - Ultimate Merino Wool Sleeping Bag - Two-Way Zipper Adjustable Universal Size Sleep Sack for Baby (2-24 Months) - Birch Gray
Woolino 4 Season Sleep Sack - Ultimate Merino Wool Sleeping Bag - Two-Way Zipper Adjustable Universal Size Sleep Sack for Baby (2-24 Months) - Birch Gray
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Price$109.00$129.00$93.00-25% $29.99
List:$39.99
$55.99$93.00
Price Per Unit$129.00 / count
Delivery
Get it as soon as Thursday, Jul 17
Get it as soon as Monday, Jul 21
Get it as soon as Thursday, Jul 17
Get it as soon as Thursday, Jul 17
Get it as soon as Thursday, Jul 17
Customer Ratings
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Customer reviews

4.7 out of 5 stars
4,069 global ratings

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Customers say

Customers find the baby sleep sack effective at temperature regulation, working well in various climates including hot Southern California summers, and appreciate its lovely soft wool interior. The product is durable, holding up well with weekly washings, and provides excellent sleep quality, with babies sleeping solidly through the night. Customers praise its fit, accommodating babies from 2 months to 2 years, and its appropriate weight for cooler weather. While customers consider it well worth the money, opinions on value are mixed.

370 customers mention "Warmth"326 positive44 negative

Customers appreciate the baby sleep sack's temperature regulation properties, noting it works well in various climates including hot Southern California summers, and helps maintain a comfortable body temperature throughout the night without overheating.

"...On the back of it is the dressing guide. My little one is warm and snug at night, and cool when i put him down...." Read more

"...It’s nice and thick with great features like the zipper that goes almost all the way around for easy in and out of baby, the snap buttons for the..." Read more

"Totally worth the price. Warm and cozy but breathable. I love the shoulder snaps so I don’t have to bend my lil guys arm...." Read more

"This product is great. It keeps my baby warm, is very soft and she seems comfortable in it...." Read more

340 customers mention "Softness"336 positive4 negative

Customers find the baby sleep sack soft and comfortable, with lovely wool on the inside and smooth fabric. One customer mentions that their baby sleeps soundly in it.

"...I like how this sleep sack is soft and there's plenty of room for her to grow in it...." Read more

"...Don't hesitate to buy this wonderful product. It's cozy, quality construction, and economical, in the long run...." Read more

"...to put a blanket in his crib with him Because I know that he is comfortable and he can use the sleep sack until he’s two...." Read more

"Soft, thick, and overall exactly what was expected it’s big enough I expect it to last a long time!" Read more

336 customers mention "Quality"318 positive18 negative

Customers praise the baby sleep sack's materials, noting it holds up well even with weekly washings.

"...The product itself is well made using large zips and decently sized press studs to accommodate for the thickness of the material...." Read more

"...They are worth every penny though. Great quality and two zippers for easy night time diaper changes!" Read more

"I LOVE this sleep sack. The material is marvelous and such high quality!..." Read more

"...First, it is great quality...." Read more

326 customers mention "Sleep quality"318 positive8 negative

Customers report that the sleep sack helps their babies sleep through the night, with one customer noting their child slept for 4.5-6 hour-long stretches.

"Amazing! Best sleep sack :)" Read more

"Great sleep sack, soft, easy to put on" Read more

"...They are really the best sleep sack we have come across and I can see them easily lasting 3+ babies. Definitely worth the money...." Read more

"...are a low quantity, high quality philosophy person then this is a great sleep sack for you to own...." Read more

137 customers mention "Works great"131 positive6 negative

Customers find that the baby sleep sack works well, particularly noting its effectiveness for 4-month-old infants.

"Great product, this is the second sleep sack we've purchased for our baby who is now one...." Read more

"Amazing! Best sleep sack :)" Read more

"...No more cold hands or feet. No more sweaty palms. A great, great product. Believe the hype!" Read more

"Excellent product. Very good quality. Baby sleeps well in it." Read more

126 customers mention "Fit"92 positive34 negative

Customers appreciate how well the sleep sack fits, noting that it accommodates babies from 2 months to 2 years and features adjustable underarm snaps.

"So soft and snuggly. Quality workmanship. Pretty patterns. Worth the cost. Recommend." Read more

"...Started using it when he was about 7 months old and it fits well. There is lots of room near the legs which is nice...." Read more

"...It’s so long (and my baby is in top 99% for height) and I was afraid my baby would kick her legs in the middle of the night and cover her face...." Read more

"...It fits great and is super soft. The zipper is high quality and convenient...." Read more

110 customers mention "Weight"94 positive16 negative

Customers appreciate the weight of the sleep sack, noting it is not heavy and is neither too thin nor too thick, making it suitable for regulating temperature without overheating.

"...n't trigger reactions like other kinds of wool, and although it's lightweight it can be used in a variety of temperatures...." Read more

"...The sleep sack is the perfect weight to help him feel comfort while sleeping. Overall he thrashes and jumps less when wearing this at night...." Read more

"...It's light, big and keeps the baby warm." Read more

"Easy to use, great weight, love the car seat accessibility, good quality and appreciate the versatile sizing!..." Read more

Works with the Pavlik harness for hip dysplasia!
5 out of 5 stars
Works with the Pavlik harness for hip dysplasia!
This is hands down the best item I have found to accommodate my baby in a pavlik harness for hip dysplasia. I wanted something that would still be practical even when she graduates from the harness. This is the best solution for the price. While it is expensive, it is wool, which regulates temperature well in all seasons, and can be used starting now at 2 months - 24 months. It is very well made and looks like it will last. The best part - she can wear it when I put her into her car seat or bouncer, as it has an opening for a harness (see picture)! I panicked when the doctor put her in her harness, and I realized I didn’t have anything for her to wear in the currently cold weather. This happened to arrive the same day, and it was a life saver. I’ll be purchasing another!
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Top reviews from the United States

  • Reviewed in the United States on July 5, 2024
    Color: Night SkyVerified Purchase
    The best product for infants who can no longer be swaddled. The material is soft, high quality wool. Incredible easy to put the baby in; with the ability to grow as the child grows.

    We use this for camping, stadium events, family outings. Anything where our child is going to be out past bedtime. The car seat strap holes are fantastic and help to keep the body temp regulated in any climate.

    Very long lasting material, be sure to read the wash directions! A wool safe detergent and hang dry or hand cleaning.
    6 people found this helpful
    Report
  • Reviewed in the United States on September 8, 2014
    Color: EarthVerified Purchase
    I put off buying this thing for 6 months, due to price, and now I wish I hadn't waited.

    Apparently, in order to keep babies from going up in flames, infant sleepers have to be either fleece (which stops being fluffy after only 3 washes), treated with fire resistant chemicals (um, no), or snug fitting (itchy!). Well, I was cheating by buying super big sleepers for my son, and just letting him sleep with floppy footies. Unfortunately, now that he is 9 months, the "snug fitting" sleepers are ridiculously tight, and he was waking up with freezing feet every night, even the fleece sleepers-- which are 20 bucks a pop where I live, and have to be replaced every month, because they pile up. Plus, he started crying whenever I zipped them up, because who on EARTH wants to sleep in a compression sack-- I certainly wouldn't. I itch when my tank tops are too tight!

    So I finally pressed the button and got this little gem. I've used wool baby products before, so I would encourage anyone to "lanolinize" this every few months, which helps the wool resist moisture/pee, softens it, and allows you to wash it less, and makes it hang dry quicker. However, this is as soft as Egyptian cotton and the company says it's washable, so you don't really need to. (I always handwash with a little Dr. Bronners and lanolin, though, personally).

    This bag has sturdy snaps (no scratchy velcro), which allow it to be comfy but form fitting on the upper body. Double snaps on the side comform to a smaller or bigger baby. Even though my son has TONS of room in the foot area to grow into, I have zero concerns that he will get twisted up in it... and he's a hard-core squirmer. Even with his constant caterpillar scooting and rolling, he's never complained or been uncomfortable in this, and when he does wake up at night, his feet are WARM, because he's basically sleeping in a giant mitten. It has a zip at the bottom for nighttime changes or, possibly, if you're kiddos feet are getting hot. There's an open/close spot at the crotch area for safety belts to go through. Plus, this saves money, because (underneath) the baby is sleeping in the same one-sies or shirts he/she would be using during the day, so you don't have to keep getting longer foot-ie pyja, or replacing the scratchy fleece ones.

    Don't hesitate to buy this wonderful product. It's cozy, quality construction, and economical, in the long run.

    Update: still going strong at 2 years, with occasional washing, but no special treatment whatsoever. It's even been thrown in the regular, high heat dryer several times, although I wouldn't recommend doing so regularly. My son sees the sack and knows it's time to "snuggle up" for bedtime. Love it!
    41 people found this helpful
    Report
  • Reviewed in the United States on May 25, 2019
    I have to say that I am a huge fan of the concept of sleeping bags, not just because of SIDS but because they are easy. This product is by far the best I have tried of 5 including Love to Dream, Bonds, the original Sleeping Sac, Ergo Baby, and standard Big W.

    Pros of sleeping sacs: You can change your baby without disturbing them, pick them up and take them out of the room if you need too. Leave them in it after bath time while you read and they stay warm, no waking up and crying because of the sudden drop in temperature from mummy when you settle them in your arms and need to transfer to the cot.

    Negative to sleeping sacs, they have all the different TOG rating. We are in Kansas and it can be 74 in the house at 8pm and 65 at 2am.

    That is why I love this product. I have marked four instead of 5 stars for comfort because the nature of having a 2month to 2 year sac makes it a little loose around the chest and it can bunch up slightly. But don't let that sway you away from this product.

    The wool makes it heavy, which helps settle baby come sleep time, it breathes keeps her warm and cool and is self wicking which as a new mum nobody tells you how much a baby sweats!

    The product itself is well made using large zips and decently sized press studs to accommodate for the thickness of the material. It's well thought out and while I haven't used the seatbelt pockets I intend to go in a road trip soon so will update this review accordingly. I do however use these openings to check her nappy without disturbing her.

    My biggest negative is that it smells when it's wet which is a great warning when baby springs a leak. But after washing the first few times the whole room smelled like wet wool. This however is a minor irritation and you just need to dry in a well ventelated area.

    The product itself is expensive compared to the competition, I have used 5 different brands of sleeping sacs and the woolino blows them all out of the water. As I mentioned earlier I really like having the chest area a bit tighter to prevent it riding up while baby is sleeping, however it's made to last and the next best sleeping bag I have found by ergo baby you need different TOG ratings and a new size every 3-6 months. So while individually Woolino is more expensive it's less in the long run.

    You do need two though, now that my baby has discovered her feet I would like to try the legs version so in the evenings she is dressed for he'd and we can put yet straight down without disturbing her if she drifts off.

    I can't recommend this product enough as a mother of a baby who just does not stop. Even in sleep she waves her legs around and slams them into the cot just for fun. A blanket comes off. A sleeping bag does not!

    My thanks you to the owner of this product!
    32 people found this helpful
    Report

Top reviews from other countries

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  • A F
    5.0 out of 5 stars Juste Parfait
    Reviewed in France on January 13, 2020
    Parfait doux et chaud mon bébé adore !!! Pas besoin de plusieurs gigoteuse car évolue avec l'âge de bébé. Donc économique.
    Report
  • Kyle Lisgo
    5.0 out of 5 stars HIGHLY RECOMMEND
    Reviewed in the United Kingdom on November 12, 2020
    Color: Night SkyVerified Purchase
    I absolutely love this sleeping bag and so does my little girl. It was recommended to me by a safe sleep group who are super vigilant and fussy with their recommendations.

    The fabric is very very soft but not flimsy. The zip is strong and well made. It is covered at the ends so its comfortable for little one. It's got two strong press studs at each shoulder and one under each armpit to make it fit well for little babies.
    It comes with a thermometer so you can check the room temperature so you can dress baby according to the heat. The thermometer isnt the greatest for getting a precise temperature.

    It comes with a clothing guide too so you know what to dress your baby in for the right temperature so this helps reduce the risk of SIDS

    it is a bit more expensive than other sleep suits however your paying for absolute quality and more importantly safety.

    VERY HIGHLY RECOMMEND.
  • isabella
    5.0 out of 5 stars Best sleeping bag ever
    Reviewed in Germany on March 26, 2025
    Color: EarthVerified Purchase
    This sleeping bag is amazing! It is so soft and it is well made. Highly recommend!
  • Nicla
    5.0 out of 5 stars Ottimo prodotto.ne ho comprati 2 uguali
    Reviewed in Italy on December 3, 2021
    Color: StarsVerified Purchase
    Tiene caldo. È perfetto. È quello che cercavo
  • Quirijn van Dierendonck
    5.0 out of 5 stars Geweldig product, helpt echt bij het slapen
    Reviewed in the Netherlands on July 21, 2023
    Color: StarsVerified Purchase
    Heel zacht en stevig en zwaar genoeg dat de baby niet zomaar kan omrollen (goed voor de transitieperiode na inbakeren). Heeft een handige instructiekaart hoe je je baby moet kleden in de slaapzak