Topro summer sun block sport sweat hat cap outdoor activity quick-dry Material: Polyester Hat Circ.: 52cm/20.5"(fully adjustable); Brim Width: 6.7cm/2.6" Use of sweat on mesh material through the steam on both sides can help better heat dissipation and moisture wicking Flexible elasticity Material back of the head brings no harm to your head Hat with a high temperature above 205 degrees Celsius Italian transfer ink to ensure the colorful, never fade