The great advantage of this product compared to any other product that works with electricity is that its heat gradually disappears, this is really positive to improve the results of the thermotherapy treatment. Normally the effects of the heat can last between 25 and 30 minutes, although if you use them in bed, the heat can even last all night! If you use them cold, after cooling them in the freezer for a couple of hours, we can use them for at least 15 to 20 minutes, you can put your hands inside them without any protection as there is no problem of cold burns due to the high quality cotton they are made of.