CosyDiary Merino Wool Sleep Sack – 2-24 Months, 2-Way Zipper

Soft, natural comfort for your baby

Meet the CosyDiary Merino Wool & Organic Cotton Sleep Sack, a thoughtfully engineered sleep solution that blends a 100% Australian Merino wool inner layer with a 100% organic cotton outer shell. The result is an ultra-soft touch against delicate skin, combined with breathable warmth that supports cozy nights and peaceful naps.

All-season warmth without overheating

Merino wool naturally helps regulate temperature while remaining breathable. This means the sack stays warm on cooler evenings and comfortable when the room heats up, supporting comfortable sleep throughout the year. The natural fibers also contribute to a gentle, everyday softness wash after wash.

Materials you can trust

The sleep sack uses zero polyester, chemicals, or synthetic fills—only pure Merino wool and organic cotton. This simple, natural pairing minimizes irritants and keeps care straightforward for busy families.

• 100% Merino wool inner layer for soft warmth
• 100% organic cotton outer shell for a breathable touch
• No polyester or synthetic fills for a natural feel

Grow-with-baby design

Designed as a universal size for ages 2 months to 2 years, the sack evolves with your child. Under-arm snaps provide a better fit across ages, double shoulder snaps speed up dressing, and a two-way zipper makes diaper changes quick and easy.

• Universal size to accommodate growth from 2 months to 2 years
• Under-arm snaps for adjustable snugness
• Double shoulder snaps for fast, secure dressing
• Two-way zipper for easy access without disturbing sleep

Practical, parent-friendly details

Thoughtful touches include closable seat-belt slots for smooth transfers between stroller, car seat, and crib. The design offers a snug-yet-roomy fit that supports natural hip movement and easy daily use, while meeting US safety standards for infant sleepwear.

Care is simple: natural fibers withstand regular washing and retain softness and warmth over time, making this sleep sack a reliable year-round option for growing babies.