Cotton77%,Spandex14%,Polyester2%,Polyurethan7% Small size fits Women shoe size6-8US, Medium size fits Women shoe size 8-10US Midweight extra pile cusion padding in the heel and ball protect the foot from shear and prevent painful blisters. Ideal for outdoor sports,Camping and hiking,climbing,trekking,outdoor trail,1000mile running,walking socks The Y- Heel Tab Helps With Slipping Your Socks On and Off. Great elasticity and stay up-compressed top holds the sock securely on the calf. 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