100% Naturally colored cotton– super soft, breathable, no fading,avoid allergy, zero pollution, safety and healthy, constant temperature protection Inverted zipper for easy diaper changes. Removable long sleeve to reduce overheating. Can be worn in two ways: Vest or Long Sleeve sleeping bag. Perfect for Autumn, Spring,Winter.Two types of thickness :200g filling; 300g filling. Perfect sleeping bag design allows room for kicking while keep warm whole night. Washing Guide: Machine washable.No bleach. No iron. Package contents: 1XSleepsack.