PLUG RACE liners are designed to work in tight fitting, low volume race shells. These liners provide a high performance fit, with a lace up tongue and stiff injection shin and cuff reinforcements. Featuring a 2mm Strobel sole with removable 7mm foam insoles for maximum volume adjustment underfoot. The Plug Race is a low volume liner and works best with a shell fit* of One finger (1/2”) or less If your shell is a half size, round down for this model. For best results we recommend having these liners heat molded at a shop by a professional bootfitter. Stiffer models require more attention when heated, while others can be easily molded by using the home fit kit.