Ultra light and packs down super small. Also great for going down in the spring, battles the elements surprisingly well. I love this jacket!

The Upjack is incredibly light, breathable and protective against the wind. This piece is perfect for windy days, cold days, and any time that you’d want some protection from the elements on the uphill without putting on your jacket.

I've been wearing Up Jack on a thick undershirt while hiking up in winter Hokkaido, Japan, and it keeps not being too hot nor too cold, as TREW mentioned. The large kangaroo pocket sometimes stores blown snow, but it doesn't causes any problems so far.

This is a great layer for any occasion when it's not super cold out. Packs up great too. The fit is definitely for men. I usually wear a women's large but had to get a small in this and I still roll up the sleeves.

This is a handy layer for skinning up as the name implies. It is light, packs down tiny, breathes well and repels snowfall. I wouldn't use it in drizzle. The kangaroo pocket is surprisingly handy for keeping things out of the snow during transitions. I wish it was offered in other colors.