Fxd wb.4 nitrolite™ slip on work boots are high performance double bound elastic sided work boots featuring our nitrolite™ midsole technology for all day comfort.the wb.4 slip on is australia and new zealand safety standard compliant and the bonding and composite toe have been tested and certified by benchmark product certification. Features: Upper material: Nubuck, Microfiber, TPU NITROLITE™ Proprietary Phylon midsole cushioning material Slip, oil, heat resistant 62 durometer rubber outsole AS 2210.3:2019 Personal Protective Equipment Safety Footwear Reinforced double bound elastic gusset. High density 67 durometer green heel insert for increased durability Poron midsole insert for additional heel cushioning Ventilated, antimicrobial PU footbed, sculpted for correct arch support Lightweight composite safety toe Abrasion resistant ballistic thread on all stitching Protective TPU heel kick panel YKK 10-gauge coil zip angled for easy entry and smooth movement Coated microfibre collar with ventilation for support and breathability Nylon heel tab Padded Achilles support insert Coolmax™ engineered lining is moisture wicking and accelerates drying Colours: Black, Stone or Wheat Sizes: US Sizing 5-14 FXD WB-4 Slip-On Elastic Side Safety Boot – Black, Stone or Wheat – US Sizing