The Altra 3-Sum 1.5 is a zero-drop, natural triathlon racing shoe designed for a neutral foot motion.
The Altra 3-Sum 1.5 allows you to get the most out of your feet even with the fatigue of a swim and a bike. Designed to meet the needs of the competitive triathlete, this racing shoe features a zero drop platform to encourage an efficient stride, with enough cushion to keep your tired feet happy to the finish line. Featuring a seamless upper for sockless wear, and a quicklace system that allows you to fly through T2. An anatomical fit allows for toe splay without sacrificing security.
The 3-Sum 1.5 is a minimum featured, minimum neutral shoe intended for training and racing.