The Spenco RX Full Length Arch Cushions were designed to help soothe tired feet and sore arches. They also improve body alignment, absorb shock and reduce friction that can cause blisters. These flexible arch cushions provide additional stability and support necessary to help maintain proper foot positioning. Features: Full length provides complete heel-to-toe comfort. SpenCore Material exclusive cushioning layer absorbs shock and impact. Available in multiple sizes for correct placement and better overall fit, comfort and performance. 4-way Stretch Fabric with Silpure Antimicrobial helps prevent blisters while controlling odor. Please Note: For half sizes, order the next size down. For example, if you normally wear size 10.5, order a size 10.