A retro model is a sneaker that came out previously that is released again. Retro sneakers are simultaneously the best and worst thing about sneakers. On the one hand, a retro model (aka bring-back, throwback, re-release) gives most of us the chance to grab a pair of shoes we either couldn't get before, or we wore so much we gotta have another pair. On the other hand, it's retros that seem to be the highest in demand on the resale market, making them harder to come by because of the quick buck people think they can make off of them. But we'll take any retros we can get, really.