The Thorlo SKX offers heavyweight padding at the highest impact areas the heel and the ball. This helps defend against the devastating affects of shock and shear. Lower density padding is located at the shin and lace area for increased comfort inside the boot. For even more comfort, elastic can be found in the arch preventing bunching of the sock. To increase the warmth factor, insulating hollow-core polyester is utilized throughout the stocking. All of these features combined create a perfect cold weather hiking and hunting sock.