Made with the neutral runner in mind, the Faas 550 has all the necessary (yet oh so lightweight) reinforcements for everyday training. BioRide Technology fuses the Rocker, Flex, and Groove together for more natural rhythm and enhanced speed. (Not to mention an effortless toe-off and more stability on impact.) It takes design cues from PUMA’s old school running trainer, the RS1 with its technical, breathable mesh upper and knack for smooth, controlled strides. The upper’s cage features synthetic bonded materials with cutout windows for more ventilation; the cage also wraps around the midfoot for added stability. EverRide and EverTrack in the outsole add cushioning and durability where it’s needed most, while the OrthoLite® sock liner increases breathability.