This adult bike helmet has a  faux leather outer surface and  longer brim design to keep your head from UV sunshine and rain. The inner liner can be removable and cleanable, easy to wash.  The liner is made of a high-density cushion layer, soft and comfortable.  This helmet is one size 22.5-24.6 inch head circumference.Size(L x W): Approx.11.2 x 7.9 Inch, Brim Length: Approx. 2.8 Inch. Adjustable strap with Quick Release Button and high quality Chin Protector, maximize the best fit and comfortable wearing.