Our thinnest single layer sock provides a second-skin feel. The perfect sock for all aerobic activities and great for racing, sports, and x-country flats. OUR ULTRA THIN SOCK FEATURES Recycled Polyester performance fibers keep the foot cool and dry Seam Free Toe for added comfort Y Heel promotes an anatomically correct fit Favorite socks for the minimalists Blister resistant material SINGLE LAYER SOCKS FIBER CONTENT 68% Recycled Polyester, 24% Nylon, 8% LycraA(R) SINGLE LAYER SOCK SIZING GUIDE Finding the right fit is essential for blister prevention! You can view our sizing chart below. We invite you to contact us for any additional information or head to our FAQ page to find the answers to common customer questions. As an American-made, family-owned business, we thank you for choosing Wrightsock single layer socks.