The boot worn by the world's leading public safety personnel, the 5. 11 A. T. A. C. , just got promoted. It's lighter and more comfortable, yet maintains its reputation for toughness and durability. A new air flow tongue and full-length dual durometer Ortholite footbed work to keep your feet cool, dry and comfortable all day, every day. Another new feature, the Achilles heel flex zone, gives a critical part of your foot more range of motion without compromising support. The full-grain leather toe, 840D nylon upper and shock mitigation system provide the kind of rugged protection you need; while the knife pocket keeps an important ally within reach.