The fabric is made of ultralight 10D nylon. The inner fabric is made of ultralight 7D nylon. Fabric coating to prevent down drill out. Fill type:90% 800FP waterproof duck down. The back of the sleeping bag is sewn with elastic thread, so it will scale according to your body shape. The size of the sleeping bag is as follows: we measured its size is 210x80cm before filling down, when it is filled with down, because of the expansion of feathers, the size of the sleeping bag will change, the higher the fluffiness, the smaller its size. Please note that we updated its buckle in January 2024. Only hand wash with neutral detergent, washing temperature? 30 ° C, do not expose to sunlight, gently twist dry and naturally air dry or low temperature rotary drying. Do not machine wash, dry clean, bleach, iron, do not use strong cleaning agents, bleach, and clothing softeners.