Specialized Powergrid SS Baselayer The Specialized Powergrid SS Baselayer is a short-sleeve thermal jersey that is perfect for cooler rides. Polartec(R) Power Grid(TM) fabric is a four-way stretch thermal fabric that is lightweight, stretchy, and warm. Wear this jersey as a slim-fit base-layer on the coldest of days or as an outer-layer on cool days. Features Polartec(R) Power Grid(TM) fabric four-way stretch, lightweight, warm, wind and water-resistant Slim fit SPECIFICATIONSMaterial91% Polyester, 9% Spandex Sleeve Length Short Closure Type None Fit Slim Intended Use Trail, road Special Features Polartec(R) Power Grid(TM) fabric Sizing Size Small Medium Large Extra Large2X Large Chest35-37. 5"38-40. 5"41-44. 5"45-47. 5"48-51"Waist28-31"31-34"34-36"36-39"39-42" | Specialized | Powergrid Baselayer Ss Men's | Size Medium In Dove Grey | Spandex/polyester