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(974 ratings)
95% positive over last 12 months
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Woolino 4 Season Baby Sleep Sack - Ultimate Merino Wool Baby Sleeping Bag - Two-Way Zipper Adjustable Universal Size Sleep Sack for Baby (2-24 Months) - Birch Gray

4.8 4.8 out of 5 stars 3,007 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice

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

STANDARD 100 by OEKO-TEX requires every component of a textiles product—including all thread, buttons, and trims—to be tested against a list of more than 1,000 harmful regulated and unregulated chemicals which may be harmful to human health. The assessment process is globally standardized, independently conducted, and updated at least once a year based on new scientific information or regulatory requirements. Certification focus: #ProductSafety and #ChemicalsUsed.

Learn more about this certification

Certification Number

23.HUS.59156
Part of
Climate Pledge Friendly

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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.

Additional Details

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Customer ratings by feature

Comfort
4.9 4.9
Softness
4.8 4.8
Durability
4.7 4.7
Sleep quality
4.6 4.6

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$109.00
Get it as soon as Monday, Mar 25
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Sold by Woolino and ships from Amazon Fulfillment.
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$57.99
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Woolino 4 Season Baby Sleep Sack - Ultimate Merino Wool Baby Sleeping Bag - Two-Way Zipper Adjustable Universal Size Sleep Sack for Baby (2-24 Months) - Birch Gray
Woolino 4 Season Baby Sleep Sack - Ultimate Merino Wool Baby Sleeping Bag - Two-Way Zipper Adjustable Universal Size Sleep Sack for Baby (2-24 Months) - Birch Gray
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Price$109.00$49.00$26.99$129.00$49.00$93.00
Delivery
Get it as soon as Monday, Mar 25
Get it as soon as Tuesday, Mar 26
Get it as soon as Monday, Mar 25
Get it as soon as Monday, Mar 25
Get it as soon as Monday, Mar 25
Get it as soon as Monday, Mar 25
Customer Ratings
Comfort
4.9
5.0
4.7
4.6
5.0
4.5
Softness
4.8
4.7
4.8
4.8
4.7
4.8
Sleep quality
4.6
5.0
4.6
4.8
5.0
4.6
Light weight
4.5
4.6
4.1
4.4
4.6
4.7
Value for money
4.4
4.5
4.7
Sold By
Woolino
Woolino
mosebears
Woolino
Woolino
Woolino
Sustainability features

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

STANDARD 100 by OEKO-TEX requires every component of a textiles product—including all thread, buttons, and trims—to be tested against a list of more than 1,000 harmful regulated and unregulated chemicals which may be harmful to human health. The assessment process is globally standardized, independently conducted, and updated at least once a year based on new scientific information or regulatory requirements. Certification focus: #ProductSafety and #ChemicalsUsed.

Learn more about this certification

Certification Number

23.HUS.59156
Part of
Sustainability features
Climate Pledge Friendly

From the brand

Product information

Warranty & Support

Product Warranty: For warranty information about this product, please click here

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


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Product Description

Four happy babies dressed in Woolino 4 Season Ultimate Sleep Sacks

Home of the 4 Season Ultimate Baby Sleep Bag

Made with super fine 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 weight sleep sack to use, or whether your baby will be too hot or cold while sleeping – they’ll always be just right!

Happy baby wearing a Woolino 4 Season Ultimate Baby Sleep Sack in Night Sky print
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The Benefits of Wearing Merino Wool

Merino wool is odor resistant, supremely soft, naturally breathable, and temperature regulating.

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.

Perfect comfort for better sleep. Naturally.

Baby Sleeping on back in crib wearing a Woolino 4 Season Ultimate Baby Sleep Bag in Star print.

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.

Baby sleeping on a bed of natural merino wool fibers.

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 is naturally perfect.

Woolino 4 Season sleep sacks made with merino wool

Woolino 4 Season Ultimate Baby Sleep Sack in Sheep print

Ultimate Baby Sleep Sacks

Woolino 4 Season Ultimate Toddler Sleep Sack in Star Gray print

Ultimate Toddler Sacks

Woolino 4 Season Basic Baby Sleep Sack in Butterfly print

Basic Sleep Sacks

Woolino 4 Season Baby Sleep Sack With Feet in Rainbow print

Sleep Sacks with Legs

Woolino 4 Season Big Kid Sleep Sack in Night Sky print

Big Kid Sleep Bags

Customer Reviews
4.8 out of 5 stars
3,007
4.8 out of 5 stars
799
4.7 out of 5 stars
1,038
4.8 out of 5 stars
705
4.9 out of 5 stars
15
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

Looking for specific info?

Customer reviews

4.8 out of 5 stars
4.8 out of 5
3,007 global ratings

Customers say

Customers like the quality, warmth, comfort, and sleep quality of the sleep sack. For example, they mention it's well thought out, keeps baby warm, and provides a somewhat heavyweight cozy feel. That said, opinions are mixed on the value.

AI-generated from the text of customer reviews

279 customers mention262 positive17 negative

Customers are satisfied with the quality of the sleep sack. They mention that it's well-thought-out, has amazing qualities, and is beautifully made. Customers also appreciate the sturdy seams, zipper, and merino wool inside. Overall, they say it'll make a great addition to any wardrobe.

"...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...." Read more

"Great quality, soft, and warm. The velcro openings on the front and back are great for the stroller and swing...." Read more

"...The fabric is soft and seems durable enough." Read more

"...to find a sleep sack that is 100% Merino because of its many amazing qualities (regulates heat, antimicrobial, natural!) and is machine washable...." Read more

225 customers mention197 positive28 negative

Customers like the warmth of the swaddle blanket. They say it keeps their babies warm and comfortable during sleep time. They also say it's perfect for colder months and regulates heat. Customers also mention that the material is nice and easy on/off.

"...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..." Read more

"Great quality, soft, and warm. The velcro openings on the front and back are great for the stroller and swing...." Read more

"...merino ones are infinitely better - more room, less clingy, better insulation, doesn’t need washing as often, doesn’t hold stains, more snuggly… and..." Read more

"...(regulates heat, antimicrobial, natural!) and is machine washable...." Read more

182 customers mention173 positive9 negative

Customers find the comfort of the product to be great. They say the merino wool inside is soft, and the zipper seems hardy. The length adds weight, which is comforting. Customers also mention that the product is of high quality and smooth.

"Great quality, soft, and warm. The velcro openings on the front and back are great for the stroller and swing...." Read more

"...The fabric is soft and seems durable enough." Read more

"...and is machine washable. The outer fabric is an incredibly soft brushed cotton...." Read more

"...Softest material ever, inside and out, 3)..." Read more

79 customers mention72 positive7 negative

Customers like the sleep quality of the sleep sack. They mention that it helps their baby sleep well throughout the night, it's very soft, and it makes their baby feel happy and safe. Some say that the wool makes it heavy, which helps settle baby come sleep time. Overall, customers are satisfied with the sleep performance of the 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..." Read more

"...He sleeps soundly when napping and I don't have to worry about him getting cold...." Read more

"...buttons on the top and zipper on the bottom and side because it makes sleepy changes and getting baby in and out easy...." Read more

"My 2m old girl weights 8lbs and these fit her so well!She sleep so good in them and waking up happy as ever!!!..." Read more

76 customers mention66 positive10 negative

Customers like the fit of the blanket. They mention that it is very snuggly, fits well, and is comfortable. Some appreciate that it fits from two months to two years and that the sleep sag keeps the blanket in place.

"...insulation, doesn’t need washing as often, doesn’t hold stains, more snuggly… and they’ll last up to around 2 years old, well worth the purchase, we..." Read more

"...its large size, which gives plenty of room to grow, it fits my 6mo old so well (he's on the small side)...." Read more

"We love this sack — it keeps her snug but not too hot, easy to clean and dries quickly!..." Read more

"My 2m old girl weights 8lbs and these fit her so well!She sleep so good in them and waking up happy as ever!!!..." Read more

72 customers mention66 positive6 negative

Customers like the weight of the winter weight bag. They mention that it's not too heavy but heavy enough, due to the natural weight of fabric. The whole thing is substantial without being bulky, and despite its large size, it'll still allow your baby to move around freely. The extra length adds weight, which is comforting. The wool inside is soft and thin, though your baby is always toasty.

"...The whole thing is substantial without being bulky and despite its large size, which gives plenty of room to grow, it fits my 6mo old so well..." Read more

"...Room to grow but lightweight enough he can move around freely, 2)..." Read more

"...It also uses organic cotton which is nice. I thought the winter weight bag was great and sufficiently warm, except the filling in the sleep bag is..." Read more

"...I also like that it has a nice weight to it which I wonder if it helps contribute to better sleep for my baby...." Read more

70 customers mention67 positive3 negative

Customers like the appearance of the sleep sack. They say it looks nice, they love the print and color, and that it's not too colorful.

"...Other pros of this bag are a nice design, the bag seems very well made (good zipper, good seams, etc) and the set comes with a little travel bag to..." Read more

"...The little lamb pattern is too cute. Highly recommend!" Read more

"Love that it has wool for temperature regulation. Love the print/color...." Read more

"...The design is good & it’s cute, but I see no reason for it to be well over $100...." Read more

159 customers mention107 positive52 negative

Customers are mixed about the value of the product. Some mention it's well worth the money, has a hefty price tag, and is fair for 100% wool. However, others say that it'd be better off buying another one for a while, and that it isn't really good for much.

"...more snuggly… and they’ll last up to around 2 years old, well worth the purchase, we have two and rotate them while doing laundry." Read more

"...may seem like a lot up front, but this beautiful sleep sack is worth every penny!..." Read more

"...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..." Read more

"...to fit until 2 years old (she's 5 months now), It's definitely worth the price. I'm so glad I got it!..." Read more

Works well but print peels off
4 Stars
Works well but print peels off
I love this sack but it makes me nervous about the paint peeling off, worried my baby could ingest it. I’d get one without a painted print.
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Top reviews from the United States

Reviewed in the United States on May 25, 2019
19 people found this helpful
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Reviewed in the United States on January 10, 2024
Color: Night SkyVerified Purchase
One person found this helpful
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Reviewed in the United States on February 7, 2024
Color: Night SkyVerified Purchase
One person found this helpful
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Reviewed in the United States on March 5, 2024
Color: SucculentVerified Purchase
Reviewed in the United States on December 11, 2018
16 people found this helpful
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Reviewed in the United States on October 17, 2022
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5.0 out of 5 stars The BEST for sleeping baby
Reviewed in the United States on October 17, 2022
Our 6-month old grandson is now rolling over so we needed to transition away from swaddling. I thought he would be fine with nothing but as he rolled around his crib, he would eventually stick one leg through the crib slats and struggle to pull it free. Since bumpers are no longer recommended, I decided to try the Woolino sleepsack based on all the excellent reviews, and I'm so glad we did. He sleeps soundly when napping and I don't have to worry about him getting cold. The Good: 1) Room to grow but lightweight enough he can move around freely, 2) Softest material ever, inside and out, 3) adjustable snaps for growing baby, 4) zips all the way around the bottom for easy diaper change, 5) less likely to push leg through slats on crib. 6) Woolino keeps him warm in cold temps and cooler in warm temps. The Bad: Honestly, the only downside to the Woolino is the price, $99, but considering he can wear it for several months, it's not that bad. For some, hanging to dry might be a downside but it does dry quickly. I bought the grey stripe and the rust fall color.
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11 people found this helpful
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Top reviews from other countries

Chad & Javiera H
5.0 out of 5 stars Perfect fit
Reviewed in Canada on March 16, 2024
Katie S.
5.0 out of 5 stars Worth The Hype
Reviewed in Canada on January 24, 2024
Color: RainbowVerified Purchase
Sarah
5.0 out of 5 stars A great sleep sack, worth the price!
Reviewed in Canada on January 19, 2024
Amazon Customer
5.0 out of 5 stars Excellent
Reviewed in Canada on November 18, 2023
Color: Star GrayVerified Purchase
Review
5.0 out of 5 stars Better than any other sleepsack
Reviewed in Canada on November 11, 2023
Color: SheepVerified Purchase