Amazon.com | inov-8 Mens F-Fly Black/Orange 8 Medium 。US Size 12 (I purchase 1/2 size larger in Inov8 shoes, I usually wear 111/2 and these fit) Lightweight, breathable & cushioned gym shoes. Ideal for treadmill running & cardio workouts Grippy Rubber Outsole Keep your footing with our 2.5mm thick grippy rubber outsole. Lightweight grip for any gym-based exercise, including weightlifting, cardio, functional movements, walking and running. POWERFLOW PRO Midsole A bouncy, cushioned ride that retains high levels of responsiveness is provided by the new POWERFLOW PRO foam midsole. This amazing underfoot comfort and propulsion is built in a way that still allows for the ground-feel you need when running or performing high-impact exercises. Engineered Air Mesh Upper A seamless and highly breathable engineered mesh and 3D printed upper construction combine to keep your feet cool and dry during intense workouts. At the same time a supportive Met-Cradle wraps protectively around your foot to keep you stable during high impact exercise. BOOMERANG Footbed Preserve your energy with the BOOMERANG Footbed. The insoles feature hundreds of foam beads that compress and spring back for 40% energy return during your stride. Perfect for longer cardio sessions, where maximising every bit of energy counts.  ROPE-TEC Protection and durability during rope climbs. ROPE-TEC technology embedded into the midsection of the outsole and around the arch of the foot gives protection from friction on rope climbs, and delivers increased durability.