The baby sleeping bag is made of 100% pre-washed terry cotton and has a TOG value of 0.5, ideal for warmer summer days and nights. The breathable cotton ensures excellent ventilation, perfect moisture regulation, and dries very quickly. This keeps your little one's sleeping environment at a comfortable temperature without them getting too hot. Thanks to the snug, secure fit that fits well around the neck and arms, your child can sleep comfortably and safely.