Keen Revel IV High Polar Boot (Men) - Magnet/Red CarpetKeep your feet warm and dry for hours, even on the coldest days! With a higher profile for tackling deep powder and our warmest insulation (rated to 40F), these boots also provide improved traction on icy terrain. Original Fit has generous space across the forefoot for toes to splay Heat Trapolator technology: Three layers of heat trapping materials underfoot 400g of KEEN. WARM Recycled P. E. T. insulation rated to 40F 40C Notch in back for Achilles