10.8 oz 91% recycled polyester, 9% elastane 4-way stretch woven fabric with water repellent finish. Woven mesh trim fabric under the arms and side body for ventilation. Reflective trim on back of collar and sleeve. Elastic trim at sleeve cuff. YKK front zipper closure and lower front zippered pockets. Reflective zipper pulls at lower front pockets. Integrated packable pouch. Unlined.