The refined Altra HIIT XT 2 crosstrainer shoes are more durable and flexible, delivering the ultimate workout experience. Ideal for cross training and gym workouts. Designed to Improve : Natural foot positioning, walking form, toe splay, comfort, and stability. Stack Height: 20mm/15mm. Durable reinforced mesh upper with thin synthetic and textile overlays. Lace-up closure. Padded tongue and collar. Comfortable textile lining offers a great in-shoe feel. 5mm contoured footbed with a PowerSole insole. FootShape toe box allows toes to splay naturally. Zero Drop Platform places your heel and forefoot the same distance from the ground to encourage proper, low-impact form during trail runs. Dual-layer EVA midsole with highly-responsive A-Bound top layer returns energy with each stride. Wrap-around sticky rubber outsole for enhanced grip. Measurements: Weight: 11 oz Product measurements were taken using size 9, width B - Medium. Please note that measurements may vary by size. Weight of footwear is based on a single item, not a pair.