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Layer one matters most. But will any flatter and fit like our new thermal top? Lightweight grid fleece performs as a breathable base or solo layer. Flatlock seams reduce chafing for long-lasting comfort. We love it for: cold weather running - 67% recycled polyester, 27% polyester & 6% spandex - Lightweight grid fleece - Warm, stretchy & quick-drying - Tailored fit - Flatlock seams - Locker loop - Elbow patches - Machine wash cold, tumble dry low, don't bleach, mmkay? - Designed in California, made abroad