Same game, new rules. The SUPERFLY is built for trail running, lightning fast approaches and speed ascents on casual rock. This super technical fitted fly weight shoe can be clipped to your harness or folded flat (the heel is "hinged") and stashed in your backpack while cranking the moves in your high perfomance smooth soled shoes. For low volume packing: fold heels flat, stack top side heel-to-toe and secure with laces. The product uses the same type of rubber used on climbing shoes, and some will say they are great for climbing. This is true on very rough rock, but slab or slick spots, they are useless. Great shoes though, and highly recommend. Look around for a deal, and you can find them, especially after the season, and when the new line is coming out.