cotton Imported DESIGNED FOR EARLY WALKERS - Our toddler sleep sack with feet owns UK Patent 6227564 and European Patent 009157464-0001. It is suitable for early walkers and toddlers who are more active during sleep. It gives them freedom to move while still maintaining a comfortable and snug sleep environment. With this sleep sack, you will no longer worry about them getting tangled in blankets or tripping over traditional sleep sacks. SOFT & COMFY FABRIC - We understand the importance of creating a safe and cozy sleep environment for your baby. That's why our sleep sack is made from 100% premium cotton that is gentle on your baby's delicate skin. The softness and smoothness of the fabric will keep your baby comfortable and peaceful throughout the night. It is breathable and lightweight, allowing for proper air circulation and preventing overheating in summer UNIQUE CROTCH SNAPS - This toddler sleeping sack has a row of crotch snaps on the crotch that can be fully opened. This feature together with 2-way zipper makes it more convenient for changing diaper. Side Open zipper helps distribute pressure evenly along the baby's body, minimizing discomfort and ensuring a snug yet gentle fit. Widened zipper protectors on the top will protect baby's jaw from scratching BOTH FOR SAFE AND COMFORT - Roomy Fit ensures that the sleep sack provides ample room for baby to move their legs freely, what's more is a consideration of baby's growth and hip development needs. A snug fit around the neck and armholes can help prevent the baby from slipping down into the sleep sack. We take careful consideration of various factors to minimize risks and ensure baby's comfort SIZES AVAILABLE - Please refer to our size chart carefully before you order our sleep sack. Extra Small is for 6-12 Months, Small is for 12-24 Months, Medium is for 24-36 Months, Large is for 36-48 Months. This summer sleep sack is certified as TOG 0.5, suitable for indoor temperatures of 75.2°F and above. Duomiaomiao 0.5 TOG Toddler Sleep Sack 12-24 Months 100% Cotton Lightweight Baby Sleep Sack with Feet, Breathable Comfy Toddler Wearable Blanket