The Active Duty upper is manufactured from natural leather & features a highly breathable mesh lining, The removable/replaceable shock absorbing insole offers out-of-the-box everyday comfort all day, It also features a high-traction slip-resistant sole, 440g per shoe (sample size), The Active Duty is tested & certified to European Standard EN 20347 for occupational footwear with SRA slip resistance, Full certification: EN ISO 20347:2004 OB SRA, Also available is the Active Duty CT which has the added benefit of composite toe-cap & is tested & certified to European Standards for safety footwear,