We like the Bjorn Daehlie Prime Jacket for warm-weather skiing or cool-weather pursuits where we're generating plenty of body heat. The 3-layer softshell fabric features plenty of stretch and breathability to keep us from overheating while the elastic back panel gives us even more stretch and ventilation to moderate our temperature when we're moving fast or charging up the mountain. We like how the Prime Jacket sheds wind and light precipitation while not bogging down with extra bulk and insulation that we don't need in mild temperatures or high-output activities.