This is my first post so hope I get this right! I bought a Masterbuilt 30" Vertical Propane smoker recently. It works great but it is not insulated. Outside temperatures and wind definitely make the cooking temperature flucuate. I looked online and others said to wrap insulation blankets around the smoker and either the blanket would hold itself or use velcro to hold the blanket closed. Here is what I did to solve the problem. I went to the local hardware store and bought 6' of 48 " insulation that has aluminum foil on both sides. I lined up the bottom of the insulation with the top of the bottom base and just ouside the latch. I marked where the side handle was and cut a slit and pushed the handle through. I then wrapped the insulation around the smoker to the handle on the other side, marked, cut a slit, and pushed the handle through. I continued to wrap around to the door handle, marked, cut another slit, and pushed the handle through. I continued wrapping until I got to the first handle again, marked, cut a slit and pushed the handle through. This will keep the insulation from unwrapping or blowing open. You can open the door easily by pulling this part of the insulation blanket away from the handle. I cut up from all four corners so I could lay insulation on top of the smoker. The piece over the door I cut off completely and laid it on top of the smoker. I then folded all the other pieces down as far as the stack and doubled them under. I then applied a generous amount of tape to hold the top pieces in place. I now had a completely insulated smoker which only took a few minutes to complete. As an added bonus, by doing it this way my cover also fit (tight but very nice). Used the smoker yesterday to smoke almonds at 325 and today for canadian bacon at 210-215 at outside temperatures in the low 20s with swirling winds. What a difference! The smoker temperature held extremely well and made for a great smoke. This insulation will work in both cold and hot weather. Hope others will find this of help.