Timberland White Ledge - Boys' Grade School The Timberland White Ledge boot features a waterproof leather upper to keep your feet dry and comfortable. The rubber lug sole incorporates a B.S.F.P. motion efficiency system, which means the lugs are strategically placed to follow the natural motion of your foot and disperse pressure to where it is needed. A removable EVA footbed provides cushioning and shock absorption. An adjustable lacing system promises a tailored fit.