The A.T.A.C. 2.0 6" Shield lightens things up but remains deadly serious about delivering superior safety in the most unforgiving environments. An added 5.11 SlipStream™ waterproof / bloodborne pathogen* resistant membrane, ASTM/CSA CARBON-TAC toe, and an ASTM/CSA puncture resistant board provide critical protection. Full-length dual durometer Ortholite® footbed works to keep your feet cool, dry, and comfortable all day every day. Another addition, the Achilles heel flex zone, gives a critical part of your foot more range of motion without compromising support and stability.