Spenco Gel Insole - Full length for lasting pressure relief. Contoured design supports the heel, medial arch and metatarsal (ball-of-foot). Antimicrobial top cloth helps prevent foot odor. Heel to Toe Comfort Triple Density Gel Channels Energy Flow Antimicrobial Size 1: Women's 5-6 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