These bindings are amazing. They come in two sizes S/M and L/XL, makin' sizing super simple. They are a mixture of both plastic and metal, giving you the best of both worlds! You get the flex of plastic but the stability of metal!
Every year they tweak the binding with a new little feature and they still amaze me year by year. I have ridden these for 4 years and have no complaints what so ever.
Plus you can tweak just about everything on these to your liking for the perfectionist, inside us all.