Woolino 4 Season Baby Sleep Bag Sack with Foot Opening – Merino Wool & Organic Cotton, 3-4T, Night Sky

Year-round comfort from a single sleep solution

Meet the Woolino 4 Season Sleep Bag Sack with Foot Opening in Night Sky—designed to nurture cozy, uninterrupted sleep for toddlers while growing with them. This is more than a sack; it’s a practical layer that blends premium fibers, thoughtful design, and everyday usability to support calmer nights for families.

Premium fabrics that feel naturally gentle

• Australian merino wool lining offers a luxuriously soft, natural feel with temperature regulation for seasonal comfort.
• GOTS-certified organic cotton outer provides breathable durability and a clean, gentle touch against baby’s skin.

All-season warmth with room to move

The merino wool helps maintain a balanced microclimate, making the bag suitable across four seasons when paired with appropriate sleepwear. Available in three sizes—6-18 months, 18-36 months, and 3-4T—the bag is designed to layer over regular sleepwear, reducing the need for loose blankets and keeping bedtime routines tidy.

• Foot openings accommodate mobility when awake and loosen during sleep, with a generous fit that still hugs comfortably.
• The design allows feet to tuck in for warmth, while the bottom zipper enables quick diaper changes without fully undressing.
• Machine-washable convenience makes it easy to keep the sleep environment fresh and ready for the next night.

Quality you can count on

From Woolino, a trusted name in baby sleep solutions, this sleep bag includes a 6-month warranty backed by a US-based company and US-based customer service. Woolino has earned its reputation as a top-rated choice in the USA and Canada since 2010, helping families feel confident in their sleep setup.

How to use and care tips

Dress your child in season-appropriate sleepwear and use the bag as a substitute for loose blankets to create a tidy, comfortable sleep space. The breathable merino lining works with the outer cotton to support a steady, comfortable night’s rest.