The PRO in Wigwam's Cool Lite Hiker Pro Qtr means professional grade. Patented moisture control keeps feet dry and blister free while an anatomically correct fit eliminates slippage and friction. The Wigwam Cool Lite Hiker Pro Qtr is a superior 4 season sock. X2O Acrylic contains Chitosan, a natural odor defense to keep feet fresh Dri release Micro blend performance fiber aids in moisture transport and contains FreshGuard anti microbial protection to keep sock feeling fresh, time after time Stay put leg and top construction Cushiony all over for extra comfort Foot hugging fit. Never too tight and never too loose Breathable mesh keeps airflow constant Seamless toe closure 61% Dri release, 21% Stretch Nylon, 9% Cotton, 8% X2O Acrylic, 1% SpandexThanks for supporting the All American Brand Wigwam.