OK try this - it works for me, and I hope it helps you! Put your F/T in the refrig the day before you feed, and let them thaw slowly. About an hour before feeding time, take them out of the frig and let them sit in the room near your snake (so your snake can smell dinner on the way - you'll get a better feeding response) until the heads of the feeders are room temp. If they still feel cold, they aren't ready! When the heads and bellies have reached room temp, then you can heat them up and feed your snakes. You just want to warm them up, not get them hot (too hot can also cause problems).