Saucony Men's Transition Sportop Jacket Radius Tech Mesh: 100% Polyester, Ventlite: 89% Nylon, 11% Spandex Imported Envelope style thumbholes keep sleeves down and hands warm, but stay covered when not in use Large, open hole performance mesh fabric offers just enough warmth to get you started on your run Long, lean fit with slight drop tail for coverage Zippered back storage pocket stows your essentials Envelope style thumbholes keep sleeves down and hands warm, but stay covered when not in use