COVID forced me into creating a garage gym last year and while it was great during summer and fall, winter is a bit more difficult here in the Midwest. So far, the garage stays between 30 and 40 deg F if the outside temp is above zero. This means the bars hanging on the wall get down near freezing overnight and while the kerosene heater is great at warming the garage, the bars not so much. I received my Thermabell earlier this week and I wish I had found out about this product months ago. In 10 minutes, it warms a frozen bar enough so that you grab it without your hand stinging from the cold steel. In 15 minutes, the bar is as warm as your hands and comfortable to handle. After 25 minutes, the bar is definitely warm to the touch. The Thermabell is a must if you lift outside or the garage in the winter - I'd even use it in a cold basement.
It fits over my 27mm deadlift bar and my 28.5mm power bar without a problem and covers almost collar to collar, well beyond the hand spacing rings. Buy one today, you won't regret it.