Description ***MTNTOUGH&';s Athletic Fit provides a trim, active fit without restricting movement. We suggest ordering true-to-size for the intended fit.*** The MTN TOUGH LW Performance Full-Zip Jacket is a lightweight technical layer designed for training, travel, warm-ups, and everyday wear. Breathable stretch fabric provides easy mobility and fast-drying comfort during active use, while the full-length zipper makes ventilation and layering simple as conditions change. An articulated hood, integrated thumbholes, multiple zippered pockets, and interior stash storage add practical coverage and functionality without unnecessary bulk. Sizing Size Chest Small 18.5" Medium 20" Large 21.5" X-Large 23.5" XX-Large 25.5" ***Measurements are taken with the shirt laid flat, measuring from armpit to armpit across the chest Specs Material 90% Polyester5% Spandex Manufacturer Warranty Warrantied against manufacturer defects