These boots offer 5mm CR Flex-Foam with Airmesh lining and extra Achilles support for long days of standing and walking. The spped tracker sole delivers excellent traction on treestand grates, rocks, and slick surfaces. Features: Breathable airmesh lining, extended rubber coverage, 5mm CR flex-foam, lightweight EVA midsole and rubber outsole, etc sockliner. Material: Rubber, Mesh.