Engineered for high intensity year round activities, Ventilator is a unique two sided fabric with horizontal venting channels which pushes excess heat and moisture to the surface allowing for quick cooling evaporation while providing sun production. The new Ventilator fabric is the lightest and most packable shirt available, offering breathability, lightweight feeling, and UPF protection. From working out to climbing mountains, this shirt has been fabricated to not only be dependable but extremely comfortable.