Studded all terrain sole Non-marking tactile rubber compound featuring mud-releasing lugs and 26 ice-biting carbide studs that maximize your grip on all terrains. Features: Non-marking tactile rubber compound featuring mud-releasing lugs and 26 ice-biting carbide studs that maximize your grip on all terrains. Fit: Match the sole size with your OmniTrax 3.0 boot for a perfect fit. Sole sizing information: Outdoor soles come in whole and half sizes for both Men and Women and must match the size of your Korkers winter boots to function properly (e.g. Men's Size 10 Boot = Men's Size 10 Sole). Half sizes, select the appropriately-marked sole (e.g. Men's 10.5 boot = Men's 10.5-11 sole). Boot sizing can be found on the inside tongue label or on the original Korkers boot box or sole box.