BILT Explorer Air Adventure Jacket - MD, Black 600 denier outer material with airflow mesh inset panels for maximum air cooling 1200 denier abrasion resistant sections on shoulders and elbows 3-layer construction: Removable waterproof/breathable/windproof liner, Quilted detachable satin liner, Durable outer shell with air flow inner lining Reflective details for increased visibility Hydration pack pocket with tube locator on upper back