The updated Altra HIIT XT 1.5 training shoes feature new colors and an improved upper design. Make no mistake, these training shoes are still built to withstand the pressures of more intense training sessions. These gym-ready shoes feature a sturdy PowerSole™ platform that provides superior traction and stability that athletes need for squatting and jumping. A durable rubber wrapping around the outsole and up on the medial side helps provide better grip on rope climbs. For high intensity interval training (HIIT) and CrossFit® workouts that involve blending strength and conditioning components. Upper:Updated, quick-dry air mesh upper provides security, breathability, and protection. Lace-up front offers an adjustable fit. Midsole: The Zero Drop™ platform with a FootShape™ toe box allows the toes to relax and spread out naturally and the big toe to remain in a straight position for more stability and powerful toe-off to maximize running performance. Features a Dual Layer EVA and A-Bound™ technology. Outsole: PowerSole™ rubber outsole provides supreme traction and durability.