Lightweight, breathable mesh upper with 3D printed overlays for support and abrasion resistance; FuelCell foam delivers a propulsive feel to help drive you forward; Full-length Vibram Megagrip outsole with Traction Lug and deep 5mm lugs for enhanced grip in mountainous terrain; Gusseted tongue provides a secure midfoot lockdown; Weight: 308 grams (10.9 oz)