Tip: To avoid size problems, measure the weight of the dog, neck circumference, chest circumference and back length and choose the appropriate size according to the size table. Relationship between size and weight of the pet: xs-0.5 kg: s 0.5-1 kg: m 1-1.5 kg: l1.5-2.5kg: xl 2.5-4.5 kg: xxl 4.5-6.5kg ( The weight should not be the only criterion to choose a size, dogs of different races have the same weight, but have different bust lengths and back) Main material: 100% new and high quality, 65% cotton, 35% Polyester, soft and comfortable high quality cotton material to keep your cool puppy.