Men's Korkers Triple Threat Carbide - Black Triple Threat™ with Carbide Spikes bite into smooth, slick surfaces ensuring long-lasting, positive traction in treacherous terrain. DETAILS: Traction: The 100% customizable sole that gives you endless spike, bar and hex disc configurations for the ultimate in options.  Chassis: Sticky rubber outsole with over-molded stainless-steel receptacles which accept any combination of Triple Threat spikes, bars, or hex disks. Sizing: 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.