The different models have different levels of arch support, and there's a few lengthy posts about them. To sum it up in terms of arch support from least to greatest Cush-->Medic--->Remedy. I run the medic and definitely notice a welcome difference, especially on long, sloped lift line waits. I've got a foot with a medium/middle of the road arch if that helps in your selection. Took a couple hours of walking around in my boots before they conformed nicely, I was skeptical when I first laced em up but after about 3 hours I was sold.