Design: Lightweight, breathable mesh with minimized layers for a sleek fit Upper contains recycled materials FORMFIT design addresses every point of contact with your foot to ensure a personalized fit and feel In-Shoe Comfort: Higher sidewalls create an incredible underfoot sensation and supportive fit Lightweight HOLLOW-TECH guidance system provides underfoot support without restricting your stride New, softer PWRRUN formula gives you pillowy soft cushioning with less weight for your softest run yet PWRRUN+ cushioned sockliner adds an extra layer of comfort closer to your foot Midsole geometry is shaped for a super smooth ride from heel-to-toe Durability & Traction: Increased durability with more rubber where you need it XT-900 premium carbon rubber outsole for ultimate traction Additional Details: Weight: 8.2 oz (233g) Heel-to-toe offset: 8mm (35mm heel / 27mm forefoot)