The Tri-300 incorporates the latest triathlon shoe technology with a heat-moldable system for a race-ready, customized fit. Vented offset strap is stiff and rubberized for secure placement, pressure reduction and quick, efficient transitions. Rear pull strap is easy to grab and anchored from the bottom of the heel for super-fast shoe entry. Exo-Jet carbon outsole with silver fibers reflects heat and flexible carbon arch support adds comfort to every pedal stroke. To get the best fit, just pop these shoes in a conventional oven to soften the heat-moldable uppers, remove them after a few minutes, insert your feet and secure as you normally would. The shoes adapt to your feet as they cool for a perfectly tailored fit.