_DSC7064 By Aaron HershPublished Aug 30, 2012 comments Tweet Share Share Print << Back to StoryOpen full size in new window.The neoprene around the heel opening can flex and bend freely. Photo: Aaron Hersh 8. The neoprene around the heel opening can flex and bend freely. comments Tweet Share Share Print Liz Hichens is the Web Producer of Triathlete.com. She is an Ironman and marathon finisher and fan of all endurance sports. Follow @lizhichensFollow on Google+All articles by Liz