Reebok Men's RB4041 Black Sublite Cushion Work Athletic Sublite Cushion Work achieves maximum lightness and flexibility in a work shoe. With deep flex grooves, the Sublite foam midsole reduces weight and allows for greater range of motion. Rubber pads provide traction at heel strike and forefoot takeoff while minimizing weight. Mesh uppers allow for ultimate breathability and moisture transfer for all day cooling comfort. A MemoryTech Massage footbed adapts to the unique contours of your foot. ASTM F3445 Slip Resistant F3445 is the standard testing for ASTM This process is to test the motion of walking on a quarry tile with approximately .2 grams of water. This will test the forward heel slip and the backward forepart slip. the Min coefficient is .40 Lightweight Reebok Sublite is approximately 350 grams per shoe. The lightweight Alloy toe makes this style one of the lightest safety shoes on the market.