These high-tech bottle insulators are the perfect winter or summer addition to the NX nitrous system. In the winter they keep the bottle pressure stabilized by preserving the heat, in the summer they insulate to keep the sun and excessive ambient temperatures out. Whether its heat you want to keep "in" or "out" the NX bottle jacket is the answer. By using this bottle jacket you will find it is a lot easier to maintain a consistant bottle pressure and it also improves performance of the automatic bottle heater.