[Material Description] 100% polyester [Product performance] Thick fabric, hard feel, reinforced hat top, Oxford lining, natural comfortable and breathable, light and dry, adding sweat belt inside, can absorb sweat and drain moisture, good fit head circumference, adjustable magic button design on the back, free to adjust the size of the cap circumference, practical, available in all seasons, ventilation design, not stuffy, Light and not easy to change shape easy to carry, classic curved roof baseball cap, stiff and stiff, not pick the face shape, cool and stylish [Application scenario] Daily, going out, sports, outdoor activities, travel, etc. [Suitable for people] men and women [washing instructions] Recommended hand washing less washing is appropriate not to press and rub not machine washing [Special note] This size data due to different measurement methods, Error within 1-2cm is a normal phenomenon.