SIZING (large): I wear men's shoes ranging from US size 9, which is often a little small in some places, to size 10. My feet are roughly 10 inches (+/- 1/5 in.) from heel to big toe. I always buy large socks, never medium or extra-large, and they always fit me well enough to wear. Every time I take them out of my sock drawer, the Injinji performance lightweight no-show toesocks initially look like they are too small to fit me, but they stretch and end up fitting me perfectly. My heel lines up exactly with the socks heel. The toes are a little tight but not uncomfortably so. They barely come up to my ankles and live up to the name "no-show."

This review is based on their condition after over a year of ownership, numerous times through the wash, and occasional use (Not daily. At most once or twice a week). The material is very thin and lightweight. My socks have not frayed, worn thin, or developed holes. I am satisfied and happy with these socks and I would recommend them for wearing with running shoes or just around the house.