Ill be honest, you almost have too many choices. School of Thought 1 is to go with a hard-shell pant for full water- and wind-proofing. On the affordable end you have REIs Taku Pant ($159; rei.com), which uses REIs proprietary polyurethane coating. Stretch panels aid mobility, and gussets and zippers help them fit different boots climbing boots, for instance. Over a pair of light or mid-weight long underwear, theyd be great. I have the Taku Jacket ($199) and think its great.
On the high end you have the Arcteryx Beta AR pants (arcteryx.com), made with Gores new Pro Shell material. Theyre really nice and are sized and designed to work with harnesses, big boots, underlayers, and so on. Also, Pro Shell is fantastic. Its light, tough, breathable, and waterproof. Alas, these pants run $350. Marmots Exum Pant (marmot.com) has similar features and also uses Pro Shell, and saves a few bucks at $325.
School of Thought 2 is to go with soft shell pants, as they repel enough moisture to keep you healthy, have a wide comfort range, and eliminate an extra garment. If I were to climb Rainier this year, I would not take a hard shell pant. Id take another Arcteryx item: the Gamma LT Pant ($199). These are tough, comfortable pants that are fine on their own in cool conditions and offer lots of warmth if worn over a layer. I wore a pair on some climbs last summer and love them. Id also suggest the Mammut Courmayer Pants ($179; mammut.com), which use a Schoeller material similar to what is in the Gamma LTs. The Mammut pants also are designed for mountain use, so reinforcements, zippers, and the like all are in the right place. Especially for climbs past late June, soft shells are ideal. Their only pitfall might be wet, blowing snow. But after July 1, the odds of that go down, even on Rainier.
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