The Muck Boots Men’s & Women’s MB Derwent II Wellington Boots are perfect for wet and muddy terrains. They have a temperature rating of 0 degree C to 18 degree C. These boots are made from a 4mm CR Flex-foam with a soft PK mesh lining that provide extra flexibility. It helps the boots to adjust to the shape of the foot giving you the most comfortable experience. The soft topline prevents your feet from blisters and chafing. The rubber outsole is designed with tread pattern for you to take steady steps., 4mm CR Flex-foam. PK Mesh Lining., Comfort topline. Reinforced toe and ankle., Rubber outsole with aggressive tread pattern. Temp rating 0C to 18C., CR Flex-Foam adjusts to the unique contours of your foot to create a comfortable and stable foundation while resisting blisters and chafing.,