“Vinyl Elastomer” is the glazing for the windows and doors in the “Solarium Optimum” sunrooms. It is an extremely strong vinyl that is so clear, you would swear it was glass! The vinyl has a “memory” that when hit or “poked” goes right back to its original tightness. The vinyl elastomer is UV stable and has a “cold retardant”, “fire retardant” and “fungicide” in the formula it is made of. The “cold retardant” keeps the vinyl elastomer pliable in the very cold. The “fire retardant” helps prevent fire from spreading and the “fungicide” keeps fungus such as mold from growing.