Servus Pro 15" PVC Chemical-Resistant Steel Toe Men's Work Boots, Gray, Yellow & Black (75101) Injection molded PVC with Triple Density Technology (TDT) resists degradation from many harsh chemicals; seamless and 100% waterproof; graduated height reduces chafing and irritation on the calf FOOT FORM contour cushion insole provides arch and heel support, and is removable, washable and replaceable; extended ribbed steel shank for support TDT self-cleaning outsole is made of a special compound for longer wear and slip-resistance; yellow midsole stripe indicates steel toe presence Steel toe protects against impacts from above; extra thick toe and heel guards protect against knocks and wear; electrical hazard rated outsole; ASTM F2413-11 M 1/75 C/75 EH Recommended use: food processing, petrochemical and farming