Ergodyne TREX 6384 Standard Footbed, Orange and Black, X-Large Neo Foam pads and DuPont Engage EVA provide cushion and shock dispersion. DuPont Engage EVA foam mid layer; Shock dispersing NeoFoam forefoot and heel pads Perfor-Air Ventilation System for cool comfort; Agion Antimicrobial treatment Full-length EVA Resin Base layer Nylex brushed nylon foot surface