(as of Jun 07, 2025 23:55:10 UTC – Details)
Product Description
Home of the 4 Season Ultimate Toddler Sleep Bag
Made with super soft merino wool, the 4 Season Ultimate Sleep Bag will help keep your child at a perfect temperature all year round. That means there’s no need to worry about which sleep bag to use, or whether your baby will be too hot or cold while sleeping – they’ll always be just right!
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The Benefits of Wearing Merino Wool 
The Woolino 4 Season Ultimate Toddler Sleep Bag is 100% natural, moisture-wicking, and regulates body temperature. It’s fully machine-washable, and an excellent value because it comes in one universal size that fits toddlers from 2 – 4 years.
Premium fabrics
100 Natural silky-soft Australian merino wool lining and organic cotton outer.
4 Season use
Merino’s unmatched ability to regulate body temperature provides perfect comfort in all seasons.
Grows with your baby
One universal size, 2-4 years. For smaller toddlers just close the underarm snaps to adjust the fit.
Excellent value
Year-round use. You don’t have to buy a different TOG rating sleeping bag every few months.
Easy care
Machine wash and tumble dry on no-heat setting – no hand washing fuss.
Why choose the Woolino 4 Season Ultimate Sleep Bag?
1 Premium fabrics 2 4 Season use 3 Grows with your baby 4 Excellent value 5 Easy care
Perfect Comfort for Better Sleep 
The Magic of Merino
Because of merino wool’s unique ability to regulate body temperature, it helps keep your child 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.
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.
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Woolino 4 Season sleeping bags made with merino wool
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Customer Reviews
4.7 out of 5 stars 1,060
4.7 out of 5 stars 4,036
4.6 out of 5 stars 1,121
4.7 out of 5 stars 690
3.8 out of 5 stars 24
Price
$129.00$129.00
$109.00$109.00
$93.00$93.00
$109.00$109.00
$149.00$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 – 4 Years
2 – 24 Months
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
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Shoulder Snaps
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Safety-Belt Slots for Travel
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2-Way Zipper
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Replaces Loose Blankets in Bed
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4-Season Use
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Is Discontinued By Manufacturer : No
Package Dimensions : 12.36 x 10.94 x 2.48 inches; 36.38 Pounds
Item model number : ToddlerNightSky
Department : unisex-baby
Date First Available : May 15, 2014
Manufacturer : Woolino
ASIN : B07SBJ4DNB
Country of Origin : India
Customers say
Customers find the sleep sack keeps their babies warm in winter and appreciate its soft fabric. The product receives positive feedback for its quality, with one customer noting the sturdy snaps and zips. While some customers consider it worth the price, others find it expensive.
CV123 –
Wish I had bought it sooner – also working at stopping crib climbing
When my little one grew out of his sleeping ‘dresses’ as we call them I had been eyeing this but thought the price too steep. I wish I had gotten it for him sooner. At 22 months my very large toddler started climbing out of his crib and naps became non-existent and nighttime routine was a disaster. I remembered this was made big enough for him and ordered it hoping it would keep him from getting out of the crib. Not only has it done that, but he is sleeping longer and more comfortably. He actually likes putting it on, and did not want to take it off the first night he wore it. We have only had it a few days, but so far we are all happy with it.It is a very nice soft fabric and all the snaps and zips seem very sturdy. My son is wearing a 3T or 4T and the 2-4 years fits him well with room to grow. The Nightsky pattern is cute. In his almost two hears he has probably had about a dozen sleep sacks (ones like Burts Bees, Nested Bean), and this is by far the nicest in terms of quality, weight, and softness.
audiebear –
Excellent older toddler sleep sack
I was looking for something the next size up from Halo’s XL sleep sacks. This is it, with plenty of room to grow. The material is silky smooth and soft, as others have said, and the pattern (night sky) is very attractive. It is pricey, but it appears to be high quality, and for something that your child uses for 12 hrs a day, every day, it’s definitely worth it.
Jan Arthur –
Merino wool awesome sleep sack… no need for a blanket!!
This is the best sleep sack on the market… been using the 2-24 months for 2.5 years on baby number 1… just bought her the larger size and will reuse this for baby number 2 as soon as we un swaddle him…. no need for a blanket in the winter or with AC going full tilt in VA… awesome baby shower gift … washes like a dream and dries in the dryer…
Ashley –
Love this sleep sack! Just buy it!
After my 2 year old grew out of her first woolino sleep sack I thought I could get away with cheaper sleep sacks until she didnât need one any longer. I was wrong. This is simply the best sleep sack on the market and I’ve tried a lot. It is perfect if you cant control your houses temperature and it starts off hot (high 70s) but gets chilly (mid 60âs) by morning, which is my case in Hawaii. She doesnât overheat or get too cold- meaning good nights sleep for everyone! Winning! Added bonus is she cant crawl out of her crib with this on so I havenât had to transition her to a big kid bed yet. Now I buy one for every new mom!
Done. –
Cozy and worth the price!
These are a little costly, but well made of quality fabric and wash beautifully. I have two new nephews and these sacs keep them from throwing off the covers at night and in addition make it more difficult to climb out of the crib.
Gracie G –
Perfect for spring/autumn
The quality is great but a little bit overpriced I think. It is perfect for spring/autumn use in South California. My kid loves it but we have to use a warmer one for winter.
Amazon Customer –
Great product
This company makes the best sleep sacks. I know they are pricey but well worth it .. get the 4seasons
Andra Davis –
Perfect and less worry
LOVE this sleepsack, I donât worry anymore if my son is too hot or too cold. I sleep like a baby now too with less worry.
JC –
We bought this as a my child outgrew our older ones from another brand. I was sceptical as I did not know anthing about the brand. Very good quality and excellent merino – soft and warm ans you would expect. They wash well and keep thier colour very well so far – after 3 months. Would recommend.
Louise –
We used this brand for our daughter who is now 6 and bought this one for our 2 year old. They are perfect⦠a nice weight so you know they feel cozy. Keeps them warm in the winter and not too hot in the summer. I will say the 4 season one smells terrible when you hang it to dry but donât worry that smell goes away once itâs dry.
W. Al-jawahiry –
Great blanket, ensures baby stays warm at night. Definitely worth the investment. My son has been sleeping in it for 2 years now.
Megan –
I really like this sleep sack, itâs warmer for my son during the fall/winter weather. Itâs nice and large so he will be able to grow into it until he learns how to keep blankets on at night. I did accidentally wash and dry this, realized after I wasn’t suppose to do this with heat. But it didnât shrink a whole bunch and my 2 year old still has room to grow into it, heâs on the taller side and weight 35 lbs (for reference) Would buy again.
Cait Lynn –
Hard to spend this kind of money on one thing but once I did I found it was worth it. My little is so used to sleep sacks and wasnât ready to transition to a regular blanket even though he outgrew all of the others. Finding one in 2-4t was hard but this one has been great for us. I love all the features and love that he sleeps comfortably in it!