These Large Bogs® Classic High Mens Rubber Insulated Boots size 7-13, 14, 15, 16, 17, 18, 19, and 21 are the ideal boot to tackle whatever your day may throw at you. These Big Insulated Boots are constructed with durable rubber that keeps you dry, comfortable and protected from even the most brutal conditions. These Big Mens Cold Weather Boots are built with 7mm four way stretch Neo-Tech insulation. These Large Size Winter or Snow Boots are comfort rated to -40˚F. When it comes to the best Cold Weather Boots for men, The Classic High are Contour fit for maximum support, movement, and a non-slip outsole to deliver excellent traction on any surface. 100% Waterproof Height: 14" Circumference: 16" Comfort rated from temperate to -40˚F or sub-zero conditions Natural hand-lasted rubber and a four way stretch inner bootie Non-slip, non-marking and self-cleaning outsole DuraFresh bio-technology that activates to fight unwanted odors Weight 4lbs per pair Upper MaterialsFor all of the rubber used in the upper of Bogs Boots there are two compounds – WH1 and BK4.WH1 – WH1 is formulated for the general purposes and also is resistant to Oleic Acid and other Chemicals. It is flexed 150,000 times at -20 Celsius and then soaked in Oleic Acid for 120 hours and flexed again 150,000 times at -20 Celsius. The takeaway here is no cracking of uppers in ball area of the boot.BK4 – BK4 is also resistant to Oleic Acid and other chemicals and is tested same as WH1. The difference is BK4 is made from a very soft compound and used where the boots might be rolled down (i.e. Highliner and Food Pro) or in some casual styles Bogs wants very flexible. It is a more expensive compound so Bogs limits the use depending on style. Bogs Classic High Mens