

The Fission SL (fully water proof Goretex as well) is a great climbing jacket for warmth and weight. And would now just for the extra protection.

Goretex was not something I bought the SV for however. Never needed Goretex frankly other than rain gear but have found the water proof layer really nice when it has been needed here. And if you don't need fully taped and water proof Goretex. Although feature to feature IMO the Kappa is a better buy if it is warm enough for you.

Kappa is a taped Goretex product but not warrantied to be water "proof". If you really need a cold weather jacket the SV is worth the extra price compared to the Kappa for warmth IMO. Not seen a warmer jacket that can take a real beating (day in and day out on the ski hill or in the barn) and still do the job just as well at the end of the Season as the beginning.
ARCTERYX FISSION AR FULL
I now know why you see this jacket on a lot of full time ski instructors in the Rocky Mtn States. The double chest pockets are handier if required. The SV is slightly longer, sheds wind much better than the other two and because of both the length and wind resistance, it is noticeably warmer. Mind you both of those Arcteryx jackets are really good cold weather pieces! But this is an honest comparison made by wearing all three day after day of multiple sub zero weeks this winter. The Fission SL, the "go to" hard core winter climbing coat, wasn't up to the task when the wind started blowing -25F any time of day. The Kappa, a trusted friend for winter climbing in the Alps and Canada wasn't warm enough most days early and late. Going on 60 days at or below freezing now. One of the coldest winters on record here. A life style new to me, but for the last 6 months I've been getting up just prior to dawn, rain, shine or snow to feed livestock for the last 6 months.
