Arc'Teryx Theta SK: AWESOME!
These are bomber pants: by far the best I have ever owned. I have skied in these pants for the last 7 seasons, 4 of which I spent 70+ days on-snow. Very versatile: their light design makes it easy to dress for the conditions by varying the underlayer(s): thick fleece pants for bitter VT conditions, medium-wt for PacificNW winter conditions, and thin longjohns (or none during Spring) the rest of the time. I have done tons of NE tight tree skiing and they have yet to tear. The only problem is that the stitching inside one of the powder cuffs has torn a bit, but it is repairable. The pants breathe well, the leg zippers allow you to vent while hiking/skinning, and the low bib design kept me dry in chest-deep BC powder. I cannot say enough good things about these pants.