Best for: Lightweight and breathable for intense workouts.. . The features: Soft, comfy, lightweight and breathable. With a reflective design on the back, this is a go-to workout top for the gym or for hitting the pavement.. . Our fabric: Light as air and naturally cool, our Air fabric is a nature-based, breathable blend of bamboo viscose and organic cotton with just the right amount of stretch.. .. 68% Bamboo Viscose, 28% Organic Cotton, 4% Elastane. Reflective detailing. Easy care - wash at 30°