Zip into the Aconcagua Jacket and shine on like fresh fallen snow on a moonlit night. ; Active Fit. ; Nylon shell: • 50D nylon shell in a supersoft, smooth satin-woven face. • Contoured baffles lend a lightly fitted wilhouette. • 78 g/m2 fabric weight. ; Insulation: • Goose down insulation offers high warmth with low weight.