The light , warm and breathable material of this sports skull cap and helmet liner offers ideal comfort both with and without a helmet for all bike, crossfit, riding, fitness, weight training, mountain climbing, skiing, mountain bike and road bike athletes and motorcycle riders. This skull cap beanie has a perfect fit for women and men, both in cycling and running as well as any other sports for men and women. A soft, elastic, breathable, non-slip and absorbent surface made of lycra microfiber keeps your head dry while exercising and riding a motorcycle because it helps the moisture and perspiration evaporate easily.