In reply to Mike H: latok has been rediesigned, the new version has pit zips and normal main zip system
the old version had an interesting 2 zip system which gave adjustment in size aswell as good weatherproofing without velcro or press studs
if there are old ones about they should be cheaper
the latok alpine is alot more basic/lighter, and prone to a bit of leakage in heavy wet weather on the front zip
for the 4 season bit i would tend towards the larger slightly longer cut of the latok, but for the alpine bit then latok alpine or even cheaper and more basic as most of the time you dont need a waterproof