77%Cotton,14%Spandex, 2%Polyester, 7%Elastane Small size fits Women shoe 6-8US, Medium size fits Women shoe 8-10US, Men shoe 7-9US Midweight extra pile cushion padding in the heel and ball Ideal for outdoor sports-snowboard,Camping and hiking,climbing,trekking,outdoor trail The Y- Heel Tab Helps With Slipping Your Socks On and Off. Great elasticity and stay up:compressed top holds the sock securely on ankle. Much like your footwear, the socks you wear on the hiking trail can also have a significant effect on your comfort. Arch support-elasticity : This minimizes friction and supports the arch of your foot. Compression top holds the sock securely on the calf. Ideal for outdoor sports-snowboard,Camping and hiking,skiing,climbing,trekking,outdoor trail, cycling, running,golf