Get Your FITS...and hit the trail! The Fits Pro Trail Performance Quarter Socks offer all the performance you expect from Merino Wool with a cushioned bottom and vented upper for reduced bulk. The performance top offers amazing ankle protection whether you're biking, hiking, trekking or running. It's simple: Your foot stays in; rocks stay out. Full Contact Fit: Dynamic Toe Cup: contours to the shape of your toes Heel Lock: super deep heel pocket with ample cross stretch locks the sock on your heel Full Contact Cuff: stays in place due to a tighter ankle and looser calf (proper gradience) Additional Features: Performance Cut: between a quarter and crew height Vented upper and instep for increased breathability and reduced bulk Lightweight design with cushioning in the heel, toe and bottom of foot Made in the USA Fabric: 58% Wool/32% Nyl