【SIZE】：One Size Fits Head Circumference Of 56-61(CM)/20-24(INCH).Elastic Band On The Backside, Bike Hat Are Suitable For All Adults. This Cycling Caps For Men Under Helmet Can Prevent Wind, Rain, Sweat And Dust From Bothering Cycling. Use Quality Polyester. Breathable, Wear-resistant, Super Soft Mesh.If You Are Not Satisfied With Our Bike Cap Within One Year, We Will Provide A Replacement Or Refund! No Questions Asked, Our Customers Matter! This Bicycle Helmet Visor Prevents Sweat From Dripping Into The Eyes, And The Sun Visor Can Prevent The Trouble Of Sunshine And Rain. Wearing A Cycling Skull Cap Can Effectively Prevent The Cold Wind From Causing Your Headache. The stylish design pattern allows you to look handsome even after taking off the helmet. Avoid the hassle of messy hair after taking off your cycling helmet.