These invisible liners are designed specifically to match the shape of Sperrys Authentic Original boat shoe, giving you that clean sock-less” look. The signature silicone Sperry Top-Sider wave siping pattern at the heel prevents slipping and chafing. Imported.75% cotton/22% nylon/3% SpandexSmooth toe seamAntimicrobial treatmentSize M/L fits a mens 9 1/2 to 13 shoe size