Dynafit Speed Insulation Jacket Men is a perfect men's down jacket for your winter ski mountaineering outings. Although apparently very light, it enjoys excellent thermal properties thanks to the synthetic and ecological fiber present inside also mixed with Primaloft Gold. The two central panels are nice padded and warm while the arm area is unloaded so as not to be too hot and heavy during aerobic activity. This jacket has an athletic fit as you can wear it both as an outer layer (wind and water resistant fabric) but also as a second layer on colder days. Dynafit Speed Insulation Jacket Men's down jacket