S/LAB ULTRA is the fruit of a uniquely collaborative vision between renowned ultra runner Francois d&';Haene and Salomon. Redefining the limits of pinnacle product performance, it&';s the first shoe built to keep performing after 10 to 15 hours of racing. A foam and plate combo carves out new territory for ultrarunning, bringing previously unexplored sensations.Specs Weight: 11 oz per shoe Drop: 8 mm (28.5 mm heel / 20.5 mm forefoot stack) Lug depth: 3.5 mm Cushioning: ultra plush Best for: ultra-distance trail racing, 4+ runs per week ColorwaysSAGE / CAMEO BLUE / NIGHT SKYUS sizes 7-14, including half sizes.