Grilling gloves aren't meant to be used for extended periods of time because eventually the heat will transfer through even the best pair of gloves. You need to pay attention to that gradual warming, so you know when to take a break. Also, if you squeeze the meat (or any hot item) with a good bit of pressure, that will accelerate the heat transfer and cause your fingertips to burn much more quickly. Always hold hot items securely with two hands, but try not to squeeze anything too tightly.