Injection molded PVC with Triple Density Technology (TDT) resists degradation from many harsh chemicals; seamless and 100% waterproof; reinforced at critical stress points for extended durability FOOT FORM contour cushion insole provides arch and heel support, and is removable, washable and replaceable; extended ribbed steel shank for support Dual density outsole features a tough, abrasion-resistant perimeter and a softer, slip-resistant center; tread design inhibits hydroplaning and provides better contact with the ground Steel toe protects against impacts from above; extra thick toe and heel guards protect against knocks and wear; higher, wider kick-off lugs for easy on/off Yellow midsole stripe indicates steel toe presence; ASTM F2413-11 M 1/75 C/75; Recommended use: brewing, fishing, food processing, petrochemical and farming