There's the obvious: that James Marten is a 6 foot 8 guard.
But the 26-year-old from Indianapolis has distinguished himself throughout training camp and earned a chance to be the primary backup to Lance Louis at right guard.
In fact, with Louis slowed with an ankle injury, Marten has gotten more than a few reps with the starting offense.
"That's always a good thing, to get in with them," Marten said.
Originally a third-round pick of the Dallas Cowboys in 2007, Marten was released in September 2008 and then acquired by the Oakland Raiders. He was released by the Raiders in September 2009, and the Bears added him to their practice squad a few days later.
But given his size, Marten is conspicuous on a unit that's generally inconspicuous.
"You got to stay low and shorten your steps," he said. "You're working in a phone booth."
And that makes it a challenge for someone his size. But, Marten has been through this before, starting 25 games at left guard during his college career at Boston College. He started his final 13 games at left tackle.
So far, with the Bears, he's practiced and played at both positions, which he hopes helps him.
"I got a chance," he said, "and that's all a player can ask for."