【100% Organic Cotton Outer】 Ultra Soft and Cozy Hand-feel outer with a soft polyester filling.Perfect for Autumn and Winter use.Generous sack design allows room for kicking, but cannot be kicked off so baby stays warm all night. | 【2.5 TOG Winter Sleep Sack】This is a very warm 2.5 Tog Winter Model baby sleep sack for room temperatures below 70 °F.The recommended nursery temperatures should be between 58°F to 69°F. A Baby Sleep sack surrounds the baby, providing insulation from both below and above, and also a warm pocket of air around the baby. | 【Sleeveless】Baby sleep sack should be sleeveless to aid the heat loss and air circulation. Babies sleeping under traditional blankets rarely sleep with their arms inside. Sleeveless design reduces the risk of overheating. Your baby is covered and warm all night. No more kicked off covers means your baby sleeps more comfortably. | 【SMOOTH 2-WAY ZIPPER】 Unzips from the Top, which makes it easy to place baby in sack. Unzips from the Bottom, which makes it convenient for diaper changing. With zipper protectors on the back and at the end, protects baby from scratches | 【SIZES AVAILABLE】S:0-6Months/10-18lbs; M:6-12 Months/16-24lbs; L: 12-18 Months/22-28lbs; XL: 18-24 Months/26-36lbs Machine wash with like colors，Tumble dry at low temperatures(<30°C/ 86°F).