The Reaction Series is a lighter more technical line of boots suitable for everyday winter wear - especially when the snow is deep. We have improved the outer shell, made from light-weight synthetic recyclable rubber. We added a flexible ultra-light midsole and integrated the premium rubber compound outsole to superior arch support system for more comfort. The uppers are made from double-weave 900 denier nylon which is stronger and more flexible than ever before. Five layers of inner boot guarantee this boot to a rated temperature of -40°C/-40°F.