The Tuff Stuff® Insulated Liner is just what you need on a chilly night. Made from quilted cotton. Create your own hibernation den with your little cubs! Insulation Liner requires Internal Zippers to install. Please check the inside of your Alpha for compatibility. Our first-generation tents do not have the internal zippers required for installation. A special thank you to @fooding_overlander for the liner images and video! Instructions Zip in the liner and enjoy the extra heat!