Designed primarily for tighter fitting footwear, Superfeet BLUE insoles feature their most versatile shape, and medium volume. The BLUE provides excellent biomechanical support for the widest variety of foot shapes.Good all-purpose insoles, they are ideal for feet with low to medium arches that may not tolerate maximum support.Recommended for cleated athletic footwear, running and hiking shoes, and all types of casual and dress shoes.Superfeet Insoles are designed to be trimmed to give you a perfect custom fit if you need it._ Use the size chart to give you the nearest approximate size of insole that you need. Go for a size that's a bit too large, rather than too small, you can then trim the insole down to the perfect size for your feet and footwear._ (You can either trace around your footwear's existing removable insole, or around the footwear itself, and then trim it down to size.)FOUNDATION_Superfeet's XLPE (cross-linked polyethylene) foam, FOUNDATION, provides durable biomechanical support. This ultra-light, closed-cell foam resists moisture and helps reduce shock while offering advanced comfort. FOUNDATION's resilience and strength optimizes the performance of all the Superfeet Trim-to-Fit Premium Insoles.__Agion_Superfeet treat the top covers of all their Trim-to-Fit Premium Insoles with Agion antimicrobial technology. Agion's natural, silver-based antimicrobial is built right into the insoles, giving long-lasting protection against bacteria. Agion adds continuous cleanliness to Superfeet Premium Insoles, creating a clean, comfortable combination. __Encapsulating Stabilizer System [ESS]_Superfeet Blue insoles feature a unique stabilizer cap for optimal underfoot support. When integrated with the shape and design of the foam full length, this combination creates a deep heel cup to cradle the heel's fat pad for improved natural shock absorption. This system provides comfort and necessary stability for different activities, footwear and foot types._