Superfeet Blue Insole Designed primarily for tighter fitting footwear and features a versatile shape with medium volume. Features Ideal for cleats, running, and hiking footwear, and all types of casual and dress shoes 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 Best fit for feet with low to medium arches that may not tolerate maximum support Provides excellent biomechanical support for the widest variety of foot shapes Encapsulating Stabilizer System (ESS) features a unique stabilizer cap for optimal underfoot support and a deep heel cup to improved natural shock absorption Sold as a Pair Fits US Men's 9. 5 - 11 and Women's 10. 5 - 12 | Superfeet | Blue | Insole | Size 11. 5 - 13