The Flanders Warm is designed for severe weather conditions like in spring in Flanders, or for all your rides between September and May. The High Loft fleece fabric on the inside allows that warmth won't be lost. You will enjoy this soft fabric and the excellent moisture management. The armpits are covered with mesh fabric, so perspiration is wicked away very quickly. The base layer is very stretchy which gives it a perfect fit, and the flatlock seams provide that extra touch of quality.