Don't be afraid of a little mud and dirt when you're in the Rancher Waterproof Winter Boot from Bogs. Rubber and neoprene stretch upper in a waterproof boot style with a round toe 16 inch shaft 17 inch circumference 100% waterproof Durable hand lasted rubber with a four way stretch inner bootie Lined with Bogs Max-Wick™ to keep feet dry 7mm Bogs Neo-Tech™ insulation* Comfort rated to -40˚F/-40˚C* 2mm EverDry lining contoured EVA footbed with DuraFresh bio-technology that activates to fight odors Aegis(R) anti-microbial treatment Non-marking and self-cleaning slip-resistant outsole If you wear a half-size we recommend ordering a full size up to allow proper air flow.