When it comes to pushing through the mountains, a good lower-body base-layer goes a long way. These Active Leggings are right up there with the best. A seamless construction reduces friction for unbelievable comfort when turning or twisting. And no matter how hard you work, you won't overheat: engineered ventilation on the upper front and back releases excess heat and perspiration. Minimal compression keeps muscles nice and loose the whole day - so make a day of it.