don't buy the polyester version of these, stay with cotton, polyester anything causes bad smells fyi.  Also these shrink quite a bit and so do the stretch cotton shirts (shrank a lot).  This are lightweight and awesome, as long as addidas keeps making these I will keep buying (cotton/cotton blends only of course).  Stay away from polyester socks too, under armour makes almost everything out of polyester and there products create such bad smells, trust me on this.