Most uncushioned Running socks provide the usual protections but without additional padding or fabric added to the sock fabric.
• Light cushioning. When worn, a sock with light cushioning will feel thicker and may look thicker underfoot, but it will still allow you to sense the inside of a shoe.
• Medium cushioning. Medium cushioning will have a noticeably thicker sole. The cushioning will most likely cover the top of the toe and the back of the heel, which are high-wear areas to add additional protection to the foot. Medium cushioned runner socks also take up a bit more space, so you may notice that a medium running sock makes a tighter fit within the shoe.
• Maximum cushioning. A full cushion sock will have extra cushioning throughout the entire sock, sole, top of foot, heel, sides, and up to the cuff. Full cushioned socks feel softer and thicker than any other, and you may need to wear a shoe size up or find it occasionally a tight fit into your favorite running shoes.