Plug Race LVPLUG 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 1 finger (1 2) or less Size down on the half size (ex.: 27. 5 = 27) For best results