The Lunar Force 1 is perfect as is, so leave it to Acronym founder Errolson Hugh to not find what's wrong, but improve upon what already makes the shoe great. The main idea behind the design is to ease the on and off process and Hugh came up with the solution to simply just tighten the laces once to set your preferred fit and never thinkg about it again. Why? As you see there is a zipper across the upper so you can quickly slip in and out instantly. Other new details include an extended tongue and a VAC-TECH molded heel.