The Viking Constrictor III Waterproof Boa boots are warm and highly practical winter boots for situations where insulation is needed but the boots also must be comfortable to walk in. While the heaviest ice-fishing boots are not only bulky but also so loose-fitting that longer walks can become problematic, the Constrictor offers a fit suitable for long distances when needed. Wear your Constrictor winter boots on winter hikes, for shoveling snow, when standing on the sidelines at the skating rink, and for everyday Arctic conditions. - Practical BOA lace system: adjustment by turning a wheel - Waterproof structure, tough textile surface - Primaloft insulation - Primaloft Aerogel insole, originally made for NASA, with great insulation - The Ultimate Grip Concept outer sole has a material compound and tread pattern that works great in winter use - EVA insulation - Integrated reflective elements The manufacturer does not recommend using a shoe dryer with these boots.