Chore Met Guard - Work Boot: The traditional Chore boot with a PoronXRDMetatarsal Guard offers extreme impact protections. Poron is a wearable protective material that is soft and flexible but gets hard when impacted. It offers consistent, repeated impact absorption for dependable perfomance throught the life of the boot. Comfort Range: Sub Freezing to 65F. PoronXD Metatarsal Guard. Breathable Airmesh lining. Easy to clean rubber overlay. Triple toe and quadruple rubber heel reinforcement. Steel shank. 5mm CR flex-foam. Durable, quick cleaning non-slip sole. Meets ASTM-F2413-11 M I/75 C/75 EH Mt/75. Steel toe.