The Tri-300 surpasses all existing triathlon shoe technology found on the market today. A Power Flex Strap system is a vented offset positioned straps that extends from the inside arch to the outer tendons to secure placement and reduce pressure. The strap is stiff and rubberized for quick and efficient transition. The Tri-300 offers a perfect fit for all riders through our 100% heat moldable using a home conventional oven. An Exo-Jet Carbon outsole with silver fibers to reflect heat and flexible carbon arch supports for comfort. Detailing is perfected and allows you to shave seconds with a rear puller with reflector. Our stiffest to date and super easy to grab rear pull hoop is anchored from the bottom of the heel for an efficient and quick pull-on. The vertical opening is wide enough to accommodate three fingers..