The castelli britannia jersey offers more than just great styling developed as pure performance piece for team cannondale you will love the combination of low bulk insulation and un restrictive fit for excellent mobility the main body of the jersey is constructed from castelli39s warmer fabric which uses a microfibre fleece to keep your core warm the x stretch sleeves are stretchy enough for an aero fit that yoursquove never had in a thermal jersey before and despite the insul