ELITE TRIATHLON RACING SHOE DESIGNED TO QUICKEN TRANSITIONS AND OPTIMIZE POWER FEATURES: T1-Quick strap and extra-wide collar simplifies foot entry and quickens transitions Asymmetrical heel loop makes it easier to get your finger through the loop to quickly secure the shoe during transitions 3D breathable mesh for optimal ventilation Anatomical toe cap with air intake maintains rigidity and breathability Lightweight, super-stiff carbon fiber composite sole efficiently transfers power Dual Density Cup Insole SIZE:: 44.5