Here's what other sites are saying:
Combining the sun protection of a baseball cap with the illumination of a headlamp, this innovative REI LED Trail cap is the perfect blend of fit and function! Built-in LED lights can be set to flash mode, low beam or high beam with the simple push of a button inside the brim. Slim power-pack tucked under sweatband features two coin-size, easy-to-replace batteries. Nylon/polyester construction is soft, lightweight, quick drying and machine washable. CoolMax® sweatband wicks moisture away from forehead and dries quickly. Webbing strap in back adjusts the fit.
- REI refers to the men's version