Ecco Performance - RXP 3040 (Delphin/White) - Women's: Synthetic leather and textile uppers adorns this athletic sneaker. Full length advanced Receptor technology. External Exo-Skeletal wrap around shank support. Ultra light and sleek raw and exposed compression molded Phylon midsole with anatomical underfoot architecture for the ultimate in foot sensation. Omni-directional rubber outsole with ECCO's exclusive Octopodal Technology System (OTS) lug design. Anatomically correct angle of attack heel strike zone. Dual Axis forefoot flex channels.