Propulsion CT Zip Work Boot from CAT. Features composite toe, soft, breathable mesh lining, neoprene comfort collar, YKK zip sides, SRX slip resistant rubber outsole rate to 300C, soft, breathable nylon mesh sock lining with NXT antibacterial layer to reduce odour, engineered comfort footbed with rebound foam top layer, DuoFuse midsole blends rubber and foam. 40% more resilience and 30% more abrasion resistance than standard EVA . Made from Nylon Mesh/Leather Upper.