Woolino Ultimate Baby Sleep Sack – 4 Season Merino Wool Sleeping Bag, Organic Cotton Outer, Temp Regulating Blanket, Adjustable Sleep Sack Universal Size 2–24 Months – Night Sky
$109.00
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Product description
The Ultimate 4 Season Sleep Bag 
100% Natural, wicking away moisture, regulating body temp, and an excellent value as it comes in a universal size that fits babies from 2 months to 2 years – the Woolino Ultimate Sleep Bag is the only wearable blanket your baby will need, right up until they turn two.
Features of the Ultimate Sleep Bag 
All-Season Comfort
Made with superfine merino wool, keeping your little one at the perfect temperature all year round.
Peace of Mind
No more guessing which sleep sack to use. Your baby will always be cozy and safe.
Saves You Money
One bag for all seasons — no need to buy multiple TOG-rated sleep sacks.
Easy Care
Durable and machine-washable – designed for everyday convenience.
Better Sleep
Breathable, moisture wicking merino helps baby sleep soundly. More restful nights for everyone.
Why Choose a Woolino Ultimate 4 Season Sleep Bag?
1 All-Season Comfort 2 Peace of Mind 3 Saves You Money 4 Easy Care 5 Better Sleep
Perfect comfort for better sleep. Naturally. 
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.
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.
The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. Woolino 4 Season Ultimate Baby Sleep Bag Merchant Video
Woolino 4 Season sleeping bags or sacks made with merino wool and organic cotton
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Customer Reviews
4.7 out of 5 stars 4,100
4.7 out of 5 stars 1,193
4.7 out of 5 stars 848
4.7 out of 5 stars 805
4.2 out of 5 stars 25
Price
$109.00$109.00
$129.00$129.00
$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 – 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
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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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100% Merino Wool Lining / 100% Organic Cotton Outer
Imported
#1 RATED Merino wool baby sleep sack – BEST-SELLING merino wool and organic cotton sleep sack since 2010, trusted by parents for safe sleep, comfort, and durability. Award-winning baby sleep bag (Creative Child Top Choice, Cribsie Award, Mom’s Choice Award)
SAFER AND BETTER SLEEP – Premium natural fabrics: 100% Australian merino wool lining, GOTS certified organic cotton outer. Luxuriously soft, temperature-regulating merino wool helps prevent overheating and chills, reducing wake-ups and supporting deeper, longer sleep for babies. Best sleep sack for cold nights, warm rooms, and fluctuating nursery temperatures
THE ONE AND ONLY baby sleeping bag your baby will need until they turn two. No TOG guesswork. One UNIVERSAL SIZE sleep sack fits 2 months to 2 years. Replaces multiple TOG sleep sacks as superfine merino wool provides year-round comfort
MAXIMUM VERSATILITY – Double shoulder snaps and two-way zipper for easy dressing and easy diaper changes; Seat-belt openings allow EASY TRANSFER from crib to stroller or car seat. Under-arm snaps allow this wearable blanket to grow with your baby and make it an effective swaddle transition product
TRUSTED QUALITY – Designed by a trusted US company and backed by an industry leading product warranty for your peace of mind. Made from 100% natural materials and fully OEKO-TEX STANDARD 100 certified (23.HUS.59156)
9 reviews for Woolino Ultimate Baby Sleep Sack – 4 Season Merino Wool Sleeping Bag, Organic Cotton Outer, Temp Regulating Blanket, Adjustable Sleep Sack Universal Size 2–24 Months – Night Sky
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$109.00
Shelby –
100/10 recommend
I LOVE these sleep sacks. I own 2. I cannot recommend them enough. I love that they are all season and cover a wide temperature range. We started using it as soon as my baby was big enough and it’s great this one sleep sack will be good through 24 months. It’s a pricy investment but in the long run you’re saving money by not always needing to size up or need sacks for different seasons. So many cute patterns. Easily washable and safe for your baby. The material is soft and so nice. My baby is comfy in it. Great quality.
Amazon Customer –
One Sleep Sack to Rule them All
Love this sleep sack. Soft and comfortable. The quality feels very nice. I love that it works for a range of temperatures. So far our little one seems to be a comfortable temperature in it. It fits her fine at 10 lbs. It has underarm snaps for the tiny babies, with lots of space for growth. The only downside is it needs to be dried with no heat, which can take a while, but that’s to be expected with wool. We ended up buying two so we always have one clean. It’s expensive, but it’s really one sleep sack to rule them all, based on the temperature range and size range, so it’s worth it to us.
Momma Green –
Warm, cozy, and economical…
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!
Nicole H –
Improved sleep for baby and more importantly Mummy!
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!
Maria Cecilia Herrera –
Super calidad, lo usaron 2 de mis hijos por años
A F –
Parfait doux et chaud mon bébé adore !!! Pas besoin de plusieurs gigoteuse car évolue avec l’âge de bébé. Donc économique.
Zsofia Chiorboli –
I can only share what other people wrote. This is NOT a 4 season sleeping bag I trusted the recommendations but this sleeping bag is rather thin and I found my baby crying and very cold in this at night, so she consequently was sick for a few days! I feel really disappointed, definitely not worth the price!
Baiba –
Not sure it is really for all seasons. My baby seems to be cold even in warm spring period.
Oleg Epinger –
Sehr zufrieden