The Core Mountain Cap has all the features of a "mountain cap": waterproof and windproof fabric, a warm lining, generous neck and ear flaps, and a brim that you can attach to the front panel with a button if you wishthere really is nothing more to improve! - The outer material blocks wind and waterseams are also taped - Thick 330g/m² fleece lining - The brim has a metal wire stiffener: shape it as you like - Adjustment cord at the back - Loops for attaching a chin strap of your choice - The Bluesign-approved outer fabric has a waterproof membrane and a treatment that repels water and dirt (contains no PFC compounds)