Our lightest shirt works the hardest at keeping you cool. Perfect for race day or hot weather runs thanks to ultralight, breathable fabric.Fabric & CareTo keep your Brooks gear looking and performing its best, machine wash separately in cold water before wearing, try not to use fabric softeners, and tumble dry on low heat.Lightweight breathabilityLightweight materials and mesh paneling offer premium ventilation to keep you cool.Fast-drying and flexibleOur sweat-wicking DriLayerA(R) fabric offers 4-way stretch for freedom of movement.Fit for speedA modern silhouette provides on-body feel that's not too tight, not too loose, and perfect for picking up the pace.Hangs easilyBuilt-in hanger loop at neck.Sustainably madeMade with 89% recycled polyester.SpecsFitSemi-FittedFabricDriLayer 89% Recycled Polyester, 11% SpandexbluesignAA(R)Yes