All the things you need in a stylish, fully waterproof winter boot have been designed into the new Astrid. Primaloft® lining, fluorescent rear safety bar, Icegrip sole that won't let you (fall) down. The Astrid has an Aquastop breathable, waterproof liner and insole that give you the confidence to wear them no matter what. Additionally, the insole has 2.5mm of memory foam from heel to toe that give them superior comfort. Finally Icegrip technology is a special rubber compound with unique tread design and vertical glass fiber pods that provide traction on wet ice and other slippery surfaces, as well as remaining soft and flexible in cold temperatures.