These invisible liners are designed specifically to match the shape of the authentic original boat shoe, giving you that clean sock-less” look. The signature silicone Sperry wave siping pattern at the heel prevents slipping and chafing. Imported.Combed cottonNo-show sock for boat shoesNeedle count: 200Smooth toe seamWave siping silicone non-slip heelAnti-microbial treatmentFits true to size