OUR HERO ALL WEATHER TRAINER: Train hard while treading lightly on the planet. The Primus Lite III is our hero trainer and its minimalist barefoot design, and flat zero-drop sole, lets your feet move in the most natural way possibleBUILD STRENGTH: for every run, walk, gym, and workout session, Primus Lite III offers comfort and flexibilitySUSTAINABLE: Remade with more sustainable materials that have reduced the impact this footwear has on the planetACTIVE THIN SOLE: offers the most sensory underfoot barefoot experience, providing ultimate nonslip grip and durability on hard surfaces in urban environments