Add an extra element of warmth and comfort to your Xtratuf boots with Xtratuf Bama Sokket Insulating 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. Details: Acrylic fiber and cotton tricot blend wicks away perspiration, adds an extra layer of warmth and insulation to your boots, boot liners are removable for all-season comfort, wear one size smaller than your boot size for the best fit. Material: Acrylic, Cotton.