Is There a Relativistic Mass in Santa Claus?

It's true that relativistic mass increases as you get close to the speed of light, but not physical mass. And so that wouldn't explain santa's longevity, because he's simply a he would be aging at a slower rate and delivering presents at a slower time. One thing that could be happening is he could have some kind of mass dampener. If he's got a way to decrease his mass, then that will make it easier for him to travel at high velocities. But has these other considerations too, like how does he fit all of the presents? I mean, number one, how does he get into closed, small spaces?