This quick-transition lightweight training and racing shoe features Guideglide dual-density constructon with Blade-Light Technology cushioning and side drainage. It has a Superfoam® heel crash pad and footbed, Aosta II® heel outsole and Duraplush forefoot outsole. Dynamic TPU arch support and 3D medial posting provide enhanced stability. QT2 "quick transition" upper technology for easy- on and - off. ion-mask by P2i hydro-phobic nano technology for state-of-the-art water resistance. Seamfree technology heat welded seamless upper for total comfort.