Fit & Design: Left-Right contoured so each individual sock is ergonomically designed to fit either your right foot or left foot perfectly Seamless toe is linked with a special knit stitch that eliminates the annoying bump that runs across the toes of most socks. You won't feel a thing. The Y-Stitched Heel creates a natural cup around your heel made to fit your feet Cushioning only where you need it most, with a thinner leg and foot than our full cushion Temperature regulating vents allow cool air to flow in, which helps manage moisture and prevent overheating where you need it most Technology Honeycomb Support System cradles the arch of your foot, like a firm but comfortable hug around your midfoot All calf and knee-high socks are engineered with Stay-Up Technology: the perfect tension and elasticity to keep them exactly where you want them. Tight, but not too tight Performance breathability and moisture-wicking to keep you dry, cushioned and comfortable Additional Details One purchased = One donated Machine wash cold on gentle cycle, Only non-chlorine bleach when needed, Tumble dry low, Do not iron, Do not dryclean, Do not use fabric softeners