Sorel 1964 Pac2 Buff Women's Boots Shoes Rated to -25° below zero, the PAC 2 is perfect for work and play in cold weather. The suede leather upper and handcrafted vulcanized rubber shell are seam-sealed for complete waterproofness and lined with a removable 6mm washable, recycled felt InnerBoot that traps heat next to your foot, where it belongs. Underfoot there is a herringbone outsole and a thick rubber midsole which insulates the boot from cold ground,Removable 6mm ThermoPlus felt InnerBoot,2.5mm bonded felt frost plug,Handcrafted waterproof vulcanized rubber shell with herringbone outsole.