Polyou Insole is 100% breathable, anti-bacterial and anti-fungal. Active carbon reduces foot odor, while our moisture movement system wicks away moisture for fast drying and comfort. * High Density Foam Heel Support provides comfort and durability. * EVA Comfort-Molded Cup includes air holes for maximum breathability and foot supoort. * Dri-Lex Shubuck Sweat Control Fiber manages moisture, is totally breathable and quick drying. * TPR (Thermo Pastic Resign) Sole provides maximum durability, TPR outsole offers high impact absorption.