I currently have 5 pairs of Pro XA 3D/XCR. They are absolutely comfortable and lightweight. I'm usually a 6-6.5 in most running shoes, but the size 6 was slightly big and didn't stabilize my foot as well as I wanted. I was contemplating on going smaller to 5.5. It made a vast difference for me. If you get a chance to try them on at a store, do it, then buy them here for the better pricing.