I started skiing yesterday in minus 25 degrees wearing these and just a light liner. We ended up skinning up 6,000 feet of south facing terrain on a sunny day. Nonetheless, it got hot. I remained totally comfortable in all conditions simply by venting the side zips. When we hit windy ridge tops, I instantly warmed up when I zipped them up again. These are not the best pants for crampons- but perfect for skiing. If you want to wear them while ice climbing, I recommend wearing a gaitor to trap the cuff (and to keep them from tearing if you catch a crampon).

Size small fits me great- I'm 5.10 and 135. But being a woman, the pee funnel is absolutely necessary with these pants on cold days when I've got lots of layers over them as there is no butt flap.
I find that I get cold more quickly than most people- these bibs are the ticket for me as the fabric comes high to encapsulate the core. But, I also tend to do lots of sports where I warm up and need to ventilate as these pants allow. They are a great active cold weather pant.

I was excited to see these softshell bibs, and know many who are happy with Mountain Hardwear. At 6'2", 180 lbs, these bibs did not fit very well. The suspenders had to be let out fully, which caused the back of the bibs to really stand away from my back. That seems to defeat the purpose of bibs. So I returned them. Hope they work for you...

I am 5'6 and have a 30" waist. The Small size of this bib was very long in the leg and very tight at the waist. No adjustment for waist line.

Beware the wide, flared cuffs on these pants. More suitable for a 70's disco than mountaineering. They will blow about in the wind and snag on crampons. The Mountain Hardwear site and the leaflet attached to the pants refers to a 'one-handed draw-cord and snap'on the cuff, which would be a very useful feature if it were actually present. Backcountry.com have been unable to tell me so far whether this is a fault with my pants or an error with the product description. Anyone else have a drawcord on their synchro bibs?

I bought these pants to be my new ski pants in all condition. I wanted something comfortable with a layer of fleece insulation, breathable, and full-zips (or nearly there) - oh, and bibs too. These fit the bill perfectly. They are definitely waterproof, they fit well - I would say that they have an athletic fit as they are NOT baggy), and the construction is second to none. The internal gaiters are well-designed, though they do not breathe. The side zips do leave something to be desired as they only go about halfway up one's thigh, meaning that donning and removal with ski boots on is difficult, and impossible with snowshoes. That being said, I really like them. The pockets are well thought out, and the zippers work well (be sure to add a toggle to the lower zipper on each leg as MH forgot to).
Besides skiing, I have also used these for wet/snowy winter hiking/snowshoeing, and they breathe well, vent well, and protect from the elements like Gore-Tex bibs. I couldn't ask for more. Well, I was expecting a tad more warmth, but the windproof nature makes up for the lack of fleece thickness.

Been happy with this pant for inbounds use ... a bit heavier and not as well vented as I'd like in the backcountry. My only complaint is minor - if I leave the straps too loose then they fall off of my shoulders when boarding, and if I tighten them too much I get a wedgie! Otherwise, the same bomber wind and snow protection as the synchro without the worry of snow down your butt ... and very comfy.

The straps are too short. I'm 5'10", with a longish torso. I have the medium pants. I emailed Mountain Hardwear, and they told me if I added material to lengthen the straps it would not void the warranty. Otherwise the pants seem very solid, and are a great fit for someone with an athletic, but not overly skinny build.

Great fit, very lightweight, I would highly recommend.