Thin, structured support that creates a perfect fit for all foot types in tight-fitting or lightweight footwear. Features: Perfect for lightweight running, cleated, athletic, mountain biking, golf and all types of casual and dress footwear Top covers are treated with Agion; a natural, silver-based antimicrobial built right into products for long-lasting protection against bacteria Foundation XLPE technology uses an ultra-light, closed-cell foam that resists moisture and helps reduce shock Ideal for all arch types Encapsulating Stabilizer System (ESS) features a unique stabilizer cap for optimal underfoot support and a deep heel cup to improved natural shock absorption Specs: Shoe Size (US)6 InsulatedNo Shoe Size (US)5.5 SupportLow Shoe Size (US)6.5 Shoe Size Women's (US)6.5 Shoe Size Women's (US)8 Shoe Size (US)7 Shoe Size Women's (US)7 Shoe Size Women's (US).5 Substitutes: SH0221