The Muck Boots Mens Realtree Xtra Pursuit Shadow Pull-On Boots feature a resilient forefoot support cage for stability, along with an insulation rating to -40 degrees F. This convenient, pull-on, winter hunting boot will give you the protection and performance you need to move quickly and comfortably over the most rugged terrain. Features include 5mm CR Flex-Foam, a warm fleece lining, a forefoot stability cage, a Spandura(R) upper, an aggresive rubber outtsole with optimal traction, an etc(R) Sockliner, an EVA midsole with rubber outsole pods, a rubber and EVA 3D Print for support. Comfort Range: -40 degrees F to 40 degrees F.