MATERIAL: Made of thermal spun acrylic.It is skin-friendly, soft and cozy. You\'ll never have to worry about itching with our skull hat. HAT SIZE: For Head Girth (20\" -26\"). It is very stretchy and elastic which can fit your head comfortably.Suitable for both small head and big head.It brings you a trendy skull cap or a slightly slouchy over-sized hat look based on your head size. FEATURES: Snug and lightweight feel. Brings you warm without burden. Suitable for both indoors and outdoors.sports such as hiking, camping, skiing, snowboarding, running GREAT GIFT :Take our skull cap as a gift can be a wise choice.It will become a popular gift.