Birkenstock Eco Friendly and Softball crew socks in a 4-pack. Two pairs of each kind in each pack:

Eco Friendly is an earth-friendly sock made with EcoSpun&trade fibers which are made from 100% recycled plastic bottles. 50% Cotton, 48% EcoSpun&trade polyester, 2% Spandex.

The Softball crew is a soft cotton sock great for year-round wear. 68% cotton, 30% polyester, 2% Spandex.

Colors shown left to right: Eco Friendly sand, Eco Friendly cloud grey, Softball crew loden, Softball crew espresso. Medium fits women's sizes 5 to 10 and men's sizes 5 to 8.