NOS new black bottle blanket gives you a great way to insulate your bottle to helps maintain pressure by keeping heat in the bottle when it's cold, or heat out when it's hot outside. This blanket is made of a rugged, easily cleaned Nylon outer shell with insulation. It's also an excellent dress up accessory and perfect for covering battle-scarred bottles. 7" Diameter Black Bottle Blanket with Velcro Closure. For 10 lb Nitrous Bottles.