• 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.

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

The Benefits of Wearing Merino Wool

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.

Premium materials

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, 2mo-2yrs. For smaller babies simply 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.

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 is naturally perfect.