TNR winter jacket option. The Winter Windblock cycling vest is rather light and specially developed to provide protection against extreme cold. The three layers of the Windblock fabric, fleece, membrane and polyester fabric, each have their own specific functionality with this winter vest. The fleece fabric on the inside of the vest maintains the ideal heat. The outer durable polyester layer insulates optimally and the membrane interlayer ensures that the perspiration and condensation is removed quickly and efficiently. Finished with three easily accessible rear pockets and a long lockable zipper.