The original Swix baselayer – made for movement. The RaceX Classic Long Sleeve M is the trusted original in Swix’s lineup of high-performance baselayers. Lightweight, breathable and designed to dry fast, it helps you stay comfortable through every session. The slim fit moves with your body, and the technical fabric delivers dependable comfort in both intense workouts and colder weather. Made with 70% REPREVE® recycled polyester from ocean-bound plastic, this is high-performance Swix super underwear – built to last, designed to perform.