No two seasons are alike when it comes to working out—and the winter can be especially difficult to manage when it comes to the cold weather. Icy legs? Slipping waistbands? We shudder at the thought. Luckily, Under Armour’s line of ColdGear activewear is designed with infrared technology and super-soft ColdGear fabric to reflect your body’s energy for better performance and a breathable stretch—all while keeping you nice and warm. Perhaps indoor fitness is more your wintery speed? The UA Meridian line delivers a unique type of softness that can still wick sweat like a champ. And both are worn and loved by some of the women who know fitness best. Below, six of them dish on why they choose Under Armour to keep them moving and comfortable all winter long.