Layer one matters most. But will any flatter, fit, and keep you safe like our new thermal top? The 360-degree reflective print illuminates when flashed by light, ensuring you&&';;re seen on the darkest runs. And as the months grow colder, lightweight grid fleece makes for a breathable base layer, too. We love it for: visibility for cold weather running 67% recycled polyester, 27% polyester & 6% spandex Lightweight grid fleece Reflective print all over Warm, stretchy & quick-drying Tailored fit Flatlock seams Locker loop Elbow patches Hand wash cold & air dry to preserve reflectivity, mmkay? Designed in California, made abroad