The Castelli Flanders 2 Warm Long Sleeve Women's Base Layer will keep your temperature regulated well below freezingif you're cycling in the biting cold, this is a solid investment.Bred from cold February starts in Flanders, this base layer is primed for your winter training, commuting and even off the bike excursions.The SottoZero fleecing is high-loft and luxuriously soft on your skin whilst also retaining great moisture-management properties. Underarm mesh inserts, flat-lock stitching and a contoured fit finish this dedicated cycling base layer.Key Features100% Polyester SottoZero fleece multi-denierFlat-lock stitching, underarm mesh and contoured fitTemperature range: -4c10c