SPENCO Moldable Arch Supports Spenco Material absorbs shock and reduces friction to improve overall foot comfort. Helps control, stabilize and balance the foot. Heat moldable for a custom fit. Unconditionally guaranteed for one full year. Firm customizable support for casual and athletic shoes. 4-Way Stretch fabric with Ultra-Fresh Silpure. Doctor recommended Spenco RXTM Products with exclusive air-injected Spenco Material for a soft comfort bubble environment. Sizing: Size 1: Women’s 5 – 6 Size 2: Women’s 7 – 8, Men’s 6 – 7 Size 3: Women’s 9 – 10, Men’s 8 – 9 Size 4: Women’s 11 – 12, Men’s 10 – 11 Size 5: Men’s 12 – 13 Size 6: Men’s 14 – 15