The Muck Boots Mens Bark Mossy Oak Country Woody Sport II Boots offer 5mm CR Flex-Foam with an Airmesh lining and extra Achilles support for long days of standing and walking. The Speed Tracker sole delivers excellent traction on tree stand grates, rocks, and slick surfaces. Further features a breathable airmesh lining, extended rubber coverage, 5mm CR flex-foam, a lightweight EVA midsole and rubber outsole and an etc(TM) Sockliner. Comfort Range: -20 degrees F to 50 degrees F.