One of the perks of working at Kspace is we get to actually try out the dope K-Swiss kicks as they come out (and occasionally they let us keep them). I was surprised when I first tried out the new Tubes cross trainer: I was intrigued visually by the holes (i.e., “tubes”) perforating the heels, which I discovered provided a springy bounce to my movements. But most importantly, I was most impressed from putting the Tubes into action at the gym: the fit was ideally comfortable (not always easy for a size 13), and the support and flexibility balanced perfectly during even the most strenuous of exercise. I discovered with a little research that the comfort-to-fitness ratio stems largely from the patented Superfoam padding in the heel and the special k-EVA compound forming the midsole.  According to this review from fitceleb.com, the Tubes provide additional protection to the knees during training “thanks to cushioning from a k-EVA midsole compound coupled with the motion of tubes working harmoniously with your feet.” However it works, practice proves it when it comes to rolling out these Tubes.