Better half & I have been trying different combinations of headgear to ski comfortably in freezing temps for decades. Decided to try this Combo Clava as a one quiver solution to wear under our helmets. Trolled the 'net looking for how to best pick the correct size. Best advice was from a site that recommended measuring around the head from the middle back of the head to 'just under the nose' in front. In spite of rather differently shaped heads, we both came in at approximately 22". According to the Seirus size chart provided by BackCountry.com, this would put us right in the middle of the S/M size.
Upon arrival we tried them on and found they did fit, BUT after wearing them for a few minutes, with & w/o our helmets on, a definite unpleasant pressure on our noses was noticed. And then we pulled the head-covering back to wear it as a 'face mask only' and it was obviously too tight. Checked the size chart yet again to find that 22" is within the very lower range for the L/XL. So they are going back for an exchange for said L/XL. Hope they are not too big around the eye area where the goggles are supposed to fully cover all exposed areas. We shall see...soon! Love the free 2-day ship :-)

Bought the men's small for my female 5'9" 125 frame and the women's small for my 5'4" 130 husband. Mine fit perfectly and stay in place. Husband's are a nip tight in the waist, but his legs fit great. We're both 55 and found the support let us ski moguls all day, whereas we use to crap out around 2 PM sans CW-X.

Went to Jo-Ann Fabrics (sewing store) and bought some low-profile cord locks (those do-dads that snug up your hood & hem) and used a tweezer to fish the CW-X drawstrings through the cord lock opening; now it is a snap to loosen/tighten the drawstring during the day. CW-X should add them to the design.

Husband is warm in the tights under ski pants. I wear thin silk long johns over mine to stay warm.

Also bought them for our son & his wife and they won't snowboard w/o them. Really makes a difference in the fatigue factor for them.

I wear between a size 4 and 6 in most lines of sportswear. The black size 6 pant waist was tight to the point of pulling the metal hook closure almost off the waistband; but the rise and the hip fit well. The black size 8 (oh, yes, I ordered that too, as I liked so many of the features in this pant) looked like jodhpurs in the hip and the pockets gaped in a most defective manner. Mtn Hdwr needs to clean up the defective sizing and I certainly hope Backcountry.com can send them back.

I bought this particular pant because it came in a 'long' and I was tired of looking like 'Goober'(Gomer Pyle's clueless cousin)on the slopes, but these pants have the best ergonomic fit ever. And the insulation is just enough, so they are comfortable in a wider range of temps at altitude. They are roomy to the point that I needed the next size down, but they were out of stock, so I had to hunt some down on the 'net. Outstanding design, TNF!