PRO TRI RACING SHOE DESIGNED TO SHORTEN TRANSITIONS AND OPTIMIZE POWER TRANSFER. FEATUREST1-Quick strap and extra-wide upper opening simplifies and quickens transitions.Lightweight, rigid carbon fiber composite sole efficiently transfers power.Water-resistant microfiber synthetic leather with strategic venting.Breathable 3D mesh breathes great and dries fast.External heel cup stabilizes heel.Large heel loop is easier to grab to quickly secure the shoe during transitions. SIZESTANDARD:36, 37 - 47 IN HALF SIZES, 48, 49, 50