Snug Fit design boots: Slip-on boots that feel like they are laced on; superior ankle/heel support to reduce incidences of ankle roll-over; superior arch support to reduce fatigue, finally a gum boot that moves with you, as part of you. Shaft measures approximately 15.25" from arch, Heel measures approximately 1.25", Platform measures approximately 0.5", Boot opening measures approximately 18.25" around. Viking NJV outsole – abrasion-, chemical- and slip-resistant chloroprene rubber outsole. Ultra flexible: Exceeds 305,000 Flex Rating. Safety reflective patch on the back of the boot. Heavy-duty rubber pull straps. NFPA : 1971 - 2013 protective footwear for structural fire fighting, NFPA : 1992 - 2012 liquid splash-protective against hazardous material emergencies, CSA Z195-14 / ASTM F2413-11 Grade 1 Steel toe and plate, CSA Z195-14 “Green Fir Tree” chainsaw protection - Chainsaw Protection (Highest Class 3 (28m/sec chainsaw speed as per EN ISO 17249:2013), CSA Omega - Electric shock resistant 18kV