Wem sleeveless wind-proof running jacket by ErreÇÿ Wem is the ideal sleeveless running jacket for sporty men and women.¶ÿ This sleeveless jacket is made from nylon, an extremely light and resistant material, which protects you from wind and light rain during your outdoor running sessions. In addition, its bright colours and rear reflective inserts make you extremely visible and increase your safety, especially when running along roads.¶ÿ The full-length zip makes it comfortable to wear, while the large mesh insert on the back provides better air circulation.