Aktiiv Proterra Sports Bra Plant Based Blue Racerback Size Large - Sold out online Proterra plant-based fabric crafted from castor beans and biodegradable Roica V550 stretch yarn. Premium stretch and recovery. Power-mesh inserts for added support. Treated with a 100% bio-based microalgae sweat wicking finish. 88% of the bra is made from Proterra™ Fabric: • 42% Plant-based nylon (sourced from castor beans). • 40% Biodegradable bio-accelerated nylon • 18% Roica™ V550 (advanced degradation stretch yarn