The Mercury has a light-weight and flexible dual density PU sole with a wide cut for extra comfort as well as removable comfort inner soles. It also includes a shock absorbent heel and is heat resistant up to 90° celsius . This safety boot has a 200J steel toe cap and is made of genuine split buffalo leather and polyester sandwich mesh. The DOT Mercury is NRCS, SANS 20345, SB and SRC approved.