Built with vapourlite technology the Infinity Marathon is a key piece for your training wardrobe. This top is designed to be lightweight and breathable allowing you to push your body to the limit without overheating., Vapourlite Technology. Wicks sweat and dries incredibly fast., Breathable Fabric. High Stretch Construction., Seamless Knit Construction. Eliminates chafing and skin irritation., Slim FitĀ - Eliminates bulk and distraction. Lightweight Construction.,