ALL TERRAIN SOLE(TM) Non-marking tactile rubber compound featuring mud-releasing lugs that maximize your grip on all terrains. Fit: Match the sole size with your OmniTrax 3.0 boot for a perfect fit. Please Note: Korkers Omnitrax v3.0 soles are compatible ONLY with Korkers boots that use the Omnitrax sole system, and do NOT attach to boots from other brands. 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).