Two Pairs of Interchangeable, Medical Grade, Re-attachable Orthotic Arch Supports; Patented 100% Dual Layer Memory Foam; Ergonomically Designed By A Doctor; 3-in-1 Comfort Orthotic; Silver Ion Anti-Microbial Technology in Top Cloth; Anti-Bacterial, Anti-Perspiration and Anti-Odor; Temperature Regulating Aeration Holes; Machine Washable