In reply to Sempafi:
Can't beat them on value for money. Went to 5000m with them. Side vent work great. Now in their 5th year of intense use (ski, winter trekking, climbing) they are giving up, the fabric rips with every small nick. I have the old "quechua" ones but they are identical. The inner gaiter is great, keeps snow out and you don't sweat like when using regular gaiters.
The fabric is the "soft" soft shell type, meaning it's air permeable. If static on a windy/blizzard day you'll want to add a (light) shell over it. But i wore them 95% of the time with 180g merino long jhons and regulating from the side zips.
The bad: heavy, can't be used with a belt, a "baggy" cut with a slight "bell bottom". This is great for using over ski boots but not so great when wearing crampons. The lower zip flap is closed with velcro and once full of snow the velcro will not be of any use. So you can't really tighten them up around your boots (not in the hills that is). The suspenders will sag but you can velcro them to the upper elastic band so no biggie.