Lake's MX237 Shoes combine the best of the old ways with the best of cutting edge technology. To close the shoes, you'll find two Boa reels, able to be adjusted independently so you can lock in your heel without strangling your forefoot. But the upper that closes around your foot is made from full grain leather, a choice made for comfort and a supremely personalized fit. The sole is Lake's Race Carbon. It's a carbon fiber sole built on Lake's Competition last, which is designed to direct all of your power output through the ball of your foot, but still allow a bit of wiggle room when your feet swell.