Woolino

Woolino 4 Season Ultimate Baby Sleeping Bag - Merino Wool and Organic Cotton - Universal Size Adjustable Sleep

1957+ bought in the past month

$109.00

About this item

  • 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.
$109.00

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Customer reviews

4.74,089 ratings

Customers say

Customers find this baby sleep sack well-made and appreciate its temperature-regulating merino wool, which keeps babies comfortable and prevents overheating. Customers like the material quality, with one describing it as finely knit, and find it washes up nicely and dries quickly.

★★★★★

Warm, cozy, and economical...

Momma GreenSeptember 8, 2014✓ Verified 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! Read more

★★★★★

Worth the price

CustomerDecember 8, 2025✓ Verified purchase

Great quality its soft and very well made. I am loving the temperature control aspect, with the changing weather i worry shes too warm or cool, this has helped ease that soo much! This was an easy transition to from the merlin my daughter has been loving. Read more

★★★★★

WORTH its price!

Eda A.November 22, 2025✓ Verified purchase

We used, LTD, Ergobaby, Kytebaby and regular sleep suits.. Baby wasn’t sleeping well. I’m talking about hourly waking ups!! Until I said, risk it, I ordered two of these. Quality and softness extraordinary!! Even though we kept the room between 68 to 72 nothing worked but Woolino! She is sleeping really good now and we will be using this really long time so hundred percent WORTH its price!! Others I spent hundreds and wasn’t able use more than a few months. I’m so happy with this purchase. Cozy sleeping baby 💤 Read more

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★★★★★

I wish this for every baby!

GoldieLikesJune 6, 2020✓ Verified purchase

Love this sleep sack! If you're anything like me - first time mom over here - I was obsessed with whether baby was too hot or too cold from day one. Overheating or being too cold can be uncomfortable for baby and prevent them from sleeping, and severe overheating has been linked to SIDs. Thus, keeping baby at the perfect temperature - especially as a newborn when they're bodies are still not able to regulate - has been a constant concern of mine that required much thought and effort and trial and error with what temperature to set the thermostat in our house, how many layers to dress in, etc. For my now 7.5 month old, we've been through a number of swaddles and sleep sacks. We live in Los Angeles, so pretty mild weather but still gets chilly in the winter, enough to warrant turning on the heat and obviously, very warm in the summer. We keep the baby's room between 68-72 degrees, which is the recommended range (an indoor thermostat is a must for baby's room! We have this one and we're happy with it: ThermoPro TP55 Digital Hygrometer Indoor Thermometer Humidity Gauge with Jumbo Touchscreen and Backlight Temperature Humidity) In the warmer months we've been dressing baby in a lightweight 100% cotton footLESS pajama or long-sleeve onesie with pants no undershirt, no socks and in the cooler months, footed 100% cotton pajamas, sometimes the slightly thicker organic ones, and no undershirt (please, don't dress baby in polyester, especially not at night, it does not breathe and can cause overheating). The sleep sack comes with a guide as to how to dress for what weather. We basically just followed it This is a very high quality sleep sack, from the zippers to the snaps, to the soft material and design, the weight is really nice, not too heavy but heavy enough to feel cozy. On a typical spring to summer evening, the temperature in the nursery can range from 72 to 68 or sometimes even 67 degrees farehnheith. The sleep sack keeps baby cool and dry, and warm and cozy. Just perfect. I'm not attributing the fact that baby sleeps really well ENTIRELY to the sleep sack but I do think it has helped. And also has alleviated my concerns and give me peace of mind. Priceless. Read more

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