It wasn't that warm at first, but when I used it for the 3rd or 4th time, it got warm! I was wondering if it didn't warm up from the beginning or if it depends on the person, so I put it on my boyfriend lol. He said he wants to take it off now because it's getting hot after a while. He only put it on for about 30 minutes, but it was amazing to see that the round patch changed the color a little! It was a fun experience to see for yourself that the warmth varies from person to person XD If you're not warm, try it a few more times! It can get warm slowly like me