THESE REVOLUTIONARY NEW AT55 SERIES STYLES ARE NOT ONLY HEAVY DUTY, TOUGH AND DURABLE BUT OFFER THE LATEST TECHNOLOGIES TO ENSURE THEY ARE LIGHTWEIGHT, FLEXIBLE AND COMFORTABLE IN ALL TERRAINS. ALL ROUND PROTECTION IS ASSURED WITH A QFLEX ZERO NON-METALLIC PENETRATION RESISTANT INSOLE WHILE THE ADVANCED PORON® XRD™ METATARSAL GUARD ENABLES EXTREME IMPACT PROTECTION UP TOP AND THE TECTUFF TOE BUMPER AND HEEL PROTECTION HAS YOU COVERED FRONT AND BACK.