No Show Socks, Perfectday High Quality Cotton Socks The sizing is by the U.S. Men's shoe size: Small 5-9, and Large 9.5-12. Still not sure about your size? Let us know and we'll help you out. They're 85% cotton, so your feet will stay cool and comfortable. They're long lasting. Machine washable; air-dry only. Premium Quality. Great Fit. And 100% no-show! Large silicon grip on heel prevents slipping. They stay on your feet... guaranteed! If you're not happy with the fit we will send you another size, at no extra cost. These socks are sold on Amazon.com exclusively by Angella's Lamp and shipped via Amazon. The cheaper alternatives out there, with long shipping times, are selling fakes. Their fit and quality cannot be guaranteed. If you did buy from one of these sellers and are unhappy with your purchase now is the time to try our original hosiery range from Angella's Lamp