No entry for sparks or shards. A specially constructed welder's boot, designed specifically for working with metal in extreme temperatures. The only things getting into the Vulcanus are your feet. There's no possible entry for sparks or shards of molten metal thanks to the virtually 'bomb proof' over foot flap. Weight has been remarkably reduced to produce a shoe that's as comfortable as it is safe and strong. Strong leather uppers, integrated steel toe caps and nitrile rubber outsoles (HRO) will repel all manner of corrosive chemicals associated with galvanising and working with metal. Upper: Full grain leather. Outsole: GripForce® Duo Rubber. Midsole: PU. Footbed: Hydro-Tec® Comfort insole. Fit: Normal. Sizes: 37-49. Rubber outsole Welder boot Flame retardant Velcro closing Safety standard: EN ISO 20345:2011 S3, SRC Emma MM540868 Vulcanus XD Wide Fit Welders Safety Work Boot