#Silca Gravel Wool Socks use extra merino wool yarn in the toe, perfect for keeping your toes toasty in the winter months, while still maintaining the ability to wick moisture and sweat. Unlike most wool socks we remove an equal amount of material from the heel ensuring your shoes still fit perfectly. Silca wool socks do have a lot of compression so you may want to size up if you want a more relaxed fit!