Grubs CERAMIC 5.0 S5T is the world’s first rubber safety boot that uses non-matallic materials. This means it conducts neither cold nor electricity making them popular in a wider field of safety footwear.   CERAMIC SAFETY TOE – complies with BS EN ISO 203450 S5 without cold absorbing/ emitting metal materials.   DEFENDERT, 5mm Ballistic insole – lightweight and flexible whilst passing both BS EN ISO 20344: 2004 5.8.2 penetration standard and BS EN ISO 20344: 2004 5.9 flex resistance, without the cold of Steel.   5MM INSUFOAM-ULTRAT NEOPRENE WITH CALF HEIGHT RUBBER – all round foot comfort and warmth   4mm rubber over the whole foot area makes it highly resistant to puncture and flex cracking.   6mm NITROCELLT footbed – provides a soft cushioning for an athletic shoe feel. A million microscopic nitrogen bubbles that insulate the wearer from cold surfaces.   TREDZT(DURAPRENETrubber) outsole – superior grip on a variety of surfaces, the tread is designed to work with the action of the foot, is oil resistant and passes TM144: 1999slip resistance test.   COMFORT RATING – -20ºc to 20ºc