Full-grain leather8" shaft height Waterproof construction Electrical hazard rated Steel Toe Round Toe J-Flex flexible comfort system Rubber Outsole. Are these work boots or outdoor boots? These lace-up work boots by Justin are perfect for both occasions! This pair has a waterproof construction and a steel toe that protects feet against falling or rolling objects; it can withstand up to 75 lbs. of pressure. The J-Flex flexible comfort system generates return energy to allow for superior comfort levels for those on their feet all day.