When the temps rise beyond past 110° F, the A.T.A.C. 2.0 8 Arid boot won't notice a thing. Its suede and 840D nylon upper breathes and provides outstanding support. The boot lining is finished with Agion antimicrobial treatment for odor control. 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.