Extremely durable, cushioned, and heat-resistant, Sierra keeps feet comfortable and supportive in tough conditions. It's ideal for harsh outdoor jobs, high heat environments or intense construction work. Sierra Work Boot | Product Features : 0 : ATS® technology provides ergonomic support on uneven terrain, 1 : Removable All Day Cushioning insole, 2 : Oil- and slip-resistant Duratread™ sole provides maximum wear resistance, 3 : High heat-resistant sole, 4 : 90° heel, 5 : Goodyear welt constructio