• Visible in the dark: Fluorescence, high contrast, and 3M™ Scotchlite™ Carbon Black Stretch reflectivity in critical motion zones helps drivers recognize a runner in motion • Perfect for layering: Pull the zipper up or down for temperature control. Use thumbholes to keep cold air out on chilly runs • Breathability: Updated fabric construction provides airflow and a comfortable on-body feel • Updated fabric provides airflow • Thumbholes for stay-put fit • Made with bluesign®-certified materials • Body: 84% Polyester, 16% Spandex • To keep your Brooks gear looking and performing its best • Machine wash separately before wearing • Try not to use fabric softeners and tumble dry on low heat