Product Overview ST-6 is thoughtfully designed for those who understand that sometimes, when it comes to your shoes, less is more. With a close to barefoot feel, the minimal ZipFoam™ midsole offers just enough cushioning to provide comfort and protection. Our roomy toe box provides optimal comfort and balance, while the zero drop and collapsible heel counter add to the natural fit and feel this shoe is known for. With ST-6, experience less shoe, more you.