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Sold by: Woolino
Sold by: Woolino
(974 ratings)
95% positive over last 12 months
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Woolino Merino Wool Ultimate Baby Sleep Sack - 4 Season Baby Wearable Blanket - Two-Way Zipper Adjustable Sleeping Bag for Babies and Toddlers - Universal Size (2-24 Months) - Earth

4.8 4.8 out of 5 stars 718 ratings

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  • 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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Customer ratings by feature

Durability
5.0 5.0
Comfort
4.9 4.9
Softness
4.8 4.8
Light weight
4.6 4.6

Frequently bought together

$109.00
Get it as soon as Tuesday, Apr 2
In Stock
Sold by Woolino and ships from Amazon Fulfillment.
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$55.99
Get it as soon as Tuesday, Apr 2
In Stock
Sold by Kyte Baby and ships from Amazon Fulfillment.
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Woolino

Woolino Merino Wool Ultimate Baby Sleep Sack - 4 Season Baby Wearable Blanket - Two-Way Zipper Adjustable Sleeping Bag for Babies and Toddlers - Universal Size (2-24 Months) - Earth


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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
3,011
4.8 out of 5 stars
1,205
4.7 out of 5 stars
1,037
4.8 out of 5 stars
706
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

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Important information

Legal Disclaimer

IN NO EVENT, REGARDLESS OF CAUSE, SHALL KAMTASIA (the seller) BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, PUNITIVE OR CONSEQUENTIAL DAMAGES OF ANY KIND, WHETHER ARISING UNDER BREACH OF CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, AND WHETHER BASED ON THIS AGREEMENT OR OTHERWISE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

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Woolino Merino Wool Ultimate Baby Sleep Sack - 4 Season Baby Wearable Blanket - Two-Way Zipper Adjustable Sleeping Bag for Babies and Toddlers - Universal Size (2-24 Months) - Earth
Woolino Merino Wool Ultimate Baby Sleep Sack - 4 Season Baby Wearable Blanket - Two-Way Zipper Adjustable Sleeping Bag for Babies and Toddlers - Universal Size (2-24 Months) - Earth
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Price$109.00$49.00$129.00$39.99$149.00$129.00
Delivery
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Customer Ratings
Softness
4.8
4.7
4.8
4.7
4.8
Light weight
4.6
4.6
4.4
4.7
4.7
Comfort
4.9
5.0
4.6
4.7
Sleep quality
5.0
4.8
4.4
4.7
Sold By
Woolino
Woolino
Woolino
Woolino
Woolino
Woolino

Customer reviews

4.8 out of 5 stars
4.8 out of 5
718 global ratings

Customers say

Customers like the quality, comfort, warmth, value, and fit of the sleep sack. For example, they mention it's luxurious, keeps them cool and comfortable, and is worth the price. Some are happy with ease of use, ease of cleaning, and weight.

AI-generated from the text of customer reviews

149 customers mention140 positive9 negative

Customers are satisfied with the quality of the sleep sack. They mention that it's incredible, evident, and worth every penny. They also appreciate the high-quality zippers and snaps. Customers also say that the material is breathable and natural, and it'll last for a long time.

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

"...BREATHABLE AND NATURAL material, MACHINE WASHABLE,FITS EVEN SOONER than 3months (of course, it depends on the size of your baby),..." Read more

"...This is an excellent product and worth every penny." Read more

"...Since I purchased it my little guy has been sleeping better during naps and at night...." Read more

92 customers mention92 positive0 negative

Customers are satisfied with the comfort of the blanket. They mention that it feels luxurious, and is well constructed. Some customers also mention that the wool is very soft. Overall, customers are happy with their purchase and recommend it to others.

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

"...how hard it can be here in the usa to find a practical, comfortable sleeping bag for a baby, and for an acceptable (under $50) price!..." Read more

"This is so soft and our son loves it - he is sleeping better! This is an excellent product and worth every penny." Read more

"...It takes the guess work out of pajama time and he always feels cozy but not too warm when I change him. 12/10 recommend." Read more

80 customers mention72 positive8 negative

Customers like the warmth of the product. They say it's cool when you need it and warm when you do. It's easy to keep the right temperature, and it keeps the baby warm but comfortable. It also wakes up at the perfect body temperature, which is reassuring. The wool is temperature regulating, so there's no more cold hands or feet. It can be used in a variety of temperatures.

"...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...." Read more

"...fabric, the merino wool is soooo thin, but it really keeps your baby warm without overheating.)Nice gender - neutral color...." Read more

"...the guess work out of pajama time and he always feels cozy but not too warm when I change him. 12/10 recommend." Read more

"...With this one I find its much easier to keep her the right temperature.One thing to make note of though are the washing instructions...." Read more

69 customers mention59 positive10 negative

Customers like the value of the sleep sack. They say it's worth the price, and an investment. Customers also mention that it saves money, because the baby is sleeping in it.

"...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..." Read more

"...This is an excellent product and worth every penny." Read more

"...But worth every penny. I just wish I had bought it earlier.His little feet stay warm at night!..." Read more

"...The price is more than justified.Out of all coloways I liked the grey the most, at least the way it is pictured here...." Read more

52 customers mention39 positive13 negative

Customers like the fit of the sleep sack. For example, they mention that the armhole snaps allow for a snug fit around the neck, but the length is roomy. The sizing is very generous, and the zippers are easy to use. The sleep sack has done a great job of keeping their child comfortable throughout the night. The shoulder snaps and under arm snaps for fit are helpful. The chart it comes with is also very helpful to dress your child comfortably. It's soft, warm, and adjusts for ages 2 months to 2 years. It is car seat friendly, and warm in the winter.

"...But it fits her perfectly. Moreover, I can SHORTEN THE LENGTH of the bag by using the snaps provided, and it is perfect.PROS:..." Read more

"...Shoulder snaps and under arm snaps for fit.- All around double ended zipper that allows for easy diaper changes...." Read more

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

"...Our baby has been totally happy and comfy, and getting him into his sleep sack is an important part of his nap/bedtime routine, that has really..." Read more

27 customers mention27 positive0 negative

Customers find the sleep sack easy to use. They say the shoulder snaps make it a breeze to put on and take off. They also say it regulates baby's temperature and is easy to put and take on and off. Customers also mention that the product has two shoulder snap closures, which is a very convenient feature.

"...NO OVERHEATING,easy access for diaper changes,easy to put baby in even if she is already asleep..." Read more

"...All around double ended zipper that allows for easy diaper changes...." Read more

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

"...It makes for easy in and out. It also washes really well. I followed the wash directions with wool detergent and hung it to air dry...." Read more

24 customers mention19 positive5 negative

Customers like the ease of cleaning the product. They say it washes well, and the fabric washed and dries in their machine without issue. Customers also mention that the product is naturally hygienic and rarely needs to be washe.

"...which helps the wool resist moisture/pee, softens it, and allows you to wash it less, and makes it hang dry quicker...." Read more

"...BREATHABLE AND NATURAL material, MACHINE WASHABLE,FITS EVEN SOONER than 3months (of course, it depends on the size of your baby),..." Read more

"...It makes for easy in and out. It also washes really well. I followed the wash directions with wool detergent and hung it to air dry...." Read more

"...Four stars because this is a bit of a pain to clean...." Read more

24 customers mention18 positive6 negative

Customers like the weight of the product. For example, they mention it's soft, has a heavier feel, and is somewhat weighted.

"...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

"...very soft and (at least compared to the others we'd tried) has a good weight to it. My baby no longer seemed ice cold at night...." Read more

"...the woolino easier to get on and off, however... woolino does not make a heavyweight sack if you want to keep the thermostat lower than 65 degrees..." 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

Seriously the best sleepsack and so worth the money
5 Stars
Seriously the best sleepsack and so worth the money
Seriously the best sleepsack and so worth the money. Why buy a sleepsack every time they grow out of one. This goes from 2 mon to 2 years I believe. It’s great in all seasons. My 1 year old loves it and knows it’s bedtime as soon as she sees it. Love the quality of this too!!
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Top reviews from the United States

Reviewed in the United States on September 8, 2014
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15 people found this helpful
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Reviewed in the United States on November 26, 2011
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70 people found this helpful
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Reviewed in the United States on January 16, 2024
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Reviewed in the United States on August 28, 2023
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Top reviews from other countries

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Saule
5.0 out of 5 stars Soft, comfy and warm without the ticknes and bulkiness
Reviewed in the United Kingdom on November 21, 2019
Color: EarthVerified Purchase
Amazon Customer
5.0 out of 5 stars Good one. but the hands r not covered
Reviewed in India on March 3, 2017
Color: EarthVerified Purchase
steph
5.0 out of 5 stars Weich
Reviewed in Germany on April 25, 2023
Color: EarthVerified Purchase
One person found this helpful
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lynda kelly
5.0 out of 5 stars Cosy Sleep Bag
Reviewed in the United Kingdom on August 11, 2022
Color: EarthVerified Purchase
Heather Booi
5.0 out of 5 stars That's how much I love this product
Reviewed in Canada on November 16, 2017
Color: EarthVerified Purchase
35 people found this helpful
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