Add an extra element of warmth and comfort to your XTRATUF boots with XTRATUF Bama Sokket Insulating Removable Boot Liners. These removable boot liners feature a blend of acrylic and cotton tricot fibers that wick away perspiration to keep your feet comfortable in tough work conditions. Bama Sokket boot liners also insulate your feet from cold weather environments in winter seasons or northern climates.