Fast-drying merino wool sock specifically developed for tropical and warm climates. Light cushion under foot, mesh instep for enhanced breathability, reinforced heel and toe, ankle and arch support. 37.5 active particles supercharge wool's natural abilities by attracting moisture while still in vapor form, before it becomes a sweat droplet. Stay drier longer and increase athletic output. Wool 62% Spandex 6% Nylon 32%