It heats up very much! I liked it too much! The only point of attention is that it is a vest .... I didn't meet at the time of purchase and thought I had bought a LOL LOL jacket, but I liked it so much that I already ordered a jacket with sleeves. It is important to note that it is necessary to have a power bank to connect, even with a ziper pocket to place the power bank. Worth a lot, come winter lol lol