"We call this the Duo System because you are in fact using two rugs together to solve a number of problems." 2 blankets in 1 - Simply detach the liner to choose the level of warmth for your horse. Waterproof and Breathable. 1000 Denier Ballistic Nylon Outer. 100g Thermobonded fibrefill. Patented ‘V’ front closure Leg Arches™ and 3rd Surcingle. Removable Hood. Reflective Strips for added safety. 300gm liner included. (100gm, 200gm, and 400gm weight liners sold separately!)