Notched heel-guard tab for added comfort. Notched seams at toe and heel for added comfort. Breathable nylon-blend fabric, with comfortable stretch. Go-Dry moisture-wicking technology keeps you dry & comfortable. S/M = fits shoe sizes 7-10. L/XL = fits shoe sizes 10. 5-12. 5. Machine wash cold, tumble dry low. spandex 2% nylon 42% rubber 3% polyester 53%