Ultra-light flat-knit design offers zero bulk and maximum contact with feet Merino wool blend offers comfortable warmth, dries quickly, and wicks moisture Vented tops of feet for maximum breathability and moisture management Flat-knit dynamic toe cups conform to natural shape of toes for an ideal fit Extra-deep Y-shape stitching and ample cross stretch create heel pockets Touch of lycra provides stretch; No-show height for convenience Best Use:   Running Material:   66% Merino Wool / 27% Nylon / 5% Polyester / 2% Lycra Height:   No Show