Reebok knows the demands that Hytest customers face, which is why they have created this shoe only available at Hytest. The RB4100 feels and performs like a running shoe with its patented Sublite Work cushioning system technology as well as providing ESD protection and an alloy toe. The Sublite Work has a multi-material upper with mesh for a lightweight, breathable shoe. The RB4100 has a low cut design for freedom of motion at the ankle, a proprietary sublite foam technology for underfoot cushioning, a removable memorytech massage cushion footbed, an oil and slip resistant outsole with full foot flex grooves for natural movement as well as high abrasion rubber in key outsole areas for durability and traction. ESD dual resisters for static electricity protection. Alloy Toe.