Bought a heated gilet for my golf. Gilet is very comfortable and not bulky at all. Today was the first time I used it on the golf course. Started with medium heat for 1.5hrs, it was lovely and kept me so warm in a cold windy day. After 1.5hr, I turn it up to max heat, it only lasted another 30 mins or so before the battery is dead and no more heat! I would say this is the downside of this product. It’s not idea to have to change battery in the middle of a golf game. Wish the battery can last longer and max heat. At least 4 hrs with a round of golf. This is the only dissapointed bit of my purchase.