Material : Merino wool 32%, Cotton 28%, Polyester 24%, Polyurethane 10%, Spandex 6%. Made In KOREA This product shipping, one package same color 5 pairs by the customer’s choice. Size: Only Medium 1 size. ? Medium size fits Women’s Shoe size 8 – 10.5, Men’s Shoe size 7 – 9.5. Performance : Suitable for outdoor activities such as hiking, camping, mountain biking, trail running, backpacking, and trekking. It also performs well in light exercise and daily wear. In particular, the proper combination of cotton and merino wool, provides excellent air-conditioning, absorbent sweat. It is designed to keep feet warm and inside shoes in maximum comfort under any conditions. Usability : Toe, heel, sole part, enhanced by pile cushion, to protect the sole of the foot, and as much as possible prevent blistering even when wear for a long period. The support structure is applied to upper and sole of socks, to prevent rotating or come off while wearing socks. Also, the ankles use high performance rubber threads, so that the socks do not easily run down or stretch out. With high quality raw materials, for long-term use and, repeated washing, provide original form preservation.