Here's what other sites are saying:
Combining the protection of a baseball cap with the illumination of a headlamp, the innovative REI All Weather LED 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 on the underside of the brim. Slim battery pack tucked under sweatband features 2 coin-size, easily replaceable CR2032 lithium batteries. Polyester fleece construction is windproof and breathable. CoolMax(R) polyester sweatband wicks moisture away from forehead and dries quickly. Reflective webbing strap in back adjusts the fit. Fold-down earflaps add warmth and protection. Please note: do not machine wash this hat.
- REI refers to the men's version