703 PVC mining safety boots UPPER PVC SOLE PVC 100% WATERPROOF 703 PVC mining safety bootsUPPER PVCSOLE PVC100% WATERPROOFOil-proof, acid & alkali-proof, long bearing, water proof, germ-proof and smell-less, force-bearing and anti-rotting.SIZE: 40-50# 703 PVC mining safety boots