Products Description Feel good no matter how many hours you spend on your feet PU-coated materials and synthetic materials are highly durable and resistant Single-layer mesh is an open woven and breathable fabric 3D mesh is a light-weight, 3D woven fabric and is highly breathable Upper part: Single-layer mesh-breathable and open woven fabric. Lower part: Foam with an open cell structure - allows breathability, assists moisture management, is quick-drying and antimicrobial.