These unisex Trim-To-Fit Blue insoles from Superfeet are constructed with synthetic material for a great fit. Superfeet BLUE features our most versatile shape and medium volume. BLUE to provide excellent biomechanical support for the widest variety of foot shapes. Ideal for feet with low to medium arches that may not tolerate maximum support. Best for cleated athletic footwear, running and hiking shoes, and all types of casual and dress shoes.