Superb comfort and durabilith on any trailHigh performance Isolwool Wick Dry Health System keeps feet dry and comfortable Easy relaxed top for stay up comfort Lycra 3DTM knit construction throughout for a memory fit Cushioned sole with mesh knit side channels for airflow to move moisture Lycra arch panel promotes circulation and holds sock in place Reinforced heel and toe areas for extended wear Lin-toe "no feel" seams mean no irritation at toes Medium weight, crew