Horse blanket liners help give your horse an extra layer of insulation as well as some toasty warmth. Blanket liners turn your blanket with leg straps into a combo blanket system. Blanket liners come in a variety of materials. These include cotton with polyfill, acrylic fleece as well as regular fleece. Horse blanket liners are economical as you can turn your turnout sheet into a useful heavyweight blanket by adding a blanket liner!