The Spenco RX Orthotic Arch Supports help control, stabilize, and balance the foot. The full length design provides heel to toe comfort. This insole provides firm arch support to reduce pronation and supination for improved stability. Ideal for use in casual and athletic shoes, including boots, the Spenco RX Orthotic Arch Supports come in a variety of sizes for correct arch placement to improve overall fit and comfort. Spencore material offers an cushioning layer that absorbs shock and impact while providing additional comfort. A 4-way stretch fabric with Silpure antimicrobial technology helps prevent blisters as it controls odor. Flexible plastic allows you to mold the insole to fit your foot for the perfect fit. Hand wash and air dry as needed.