Vibram FiveFingers Size Chart The V-Train Gold's Gym Special Edition is the perfect training and fitness shoe, primarily for your indoor workout regiments, and for any Gold's Gym Ambassadors! It utilizes XS Trek material, which is a technical compound that allows great overall performance qualities, in particular flexibility and wet traction. Highly responsive to the various demands of life, XS Trek will carry you from the trail to the urban playground and even across a range of indoor activities, thanks to its non-marking feature. Features: - Limited Release in Collaboration with Gold's Gym - Evolution of KMD Sport LS - Provides Flexibility of a barefoot shoe with a little more structure - Special Rope Traction Lugs in arch for rope climbing - Circular lug pattern for grip during lateral movements - Insole: 2mm EVA Footbed + NZYM Anti-Microbial Poly Fabric Sockliner - Rubber: 3-Color 4 MM - Upper Material: Polyester + Spandex, TPU Panels - Weight: 6.4 oz. (size 43)