Very functional 2nd skin for cold weather
There are so many choices when it comes to long underwear bottom with great material, but the universal trend seem to be the heavier it gets, the less chance it'll have that functional aspect that's appropriate to men. In comes the Patagonia Capilene 4 Expedtion Weight Bottoms to give you all that you want in a warm pair of long underwear bottoms and a pass-thru! The material is stretchy and very comfy next to your skin. The sizing is spot on - I'm sporting a 29" waist and the small fits just right. I know I'll be in full functional comfort comes this snow season!

great for cold weather
I wore these in 17 degree weather and the cold was not an issue at all, even though I get cold easily. They're comfortable and thick but not restrictive at all, and they stayed dry.

Best long underwear EVER!
The inside is so soft and comfortable. They are smooth on the outside, not waffle fabric. The Expedition weight is comfortable under dress slacks and are keeping me warm when I need to look professional.

Works as advertised, warmest base layer bottoms
I've been snowboarding for 10 years, and these bottoms are the warmest I've worn. I was using Icebreaker for my base layers, and after discovering Capilene 4's bottoms, I've gone ahead and purchased the full-zip for the top layer as well. There's been a lot of hoopla over wool vs synthetic, and after using Icebreakers for the last several years, I can safely say that Capilene 4's will change your perspective on everything. The inside of these pants are made of almost a fuzzy material to keep your legs warm in frigid temperatures (I went on a day with 0 degree weather), something that I would notice immediately with IceBreaker 320 bottoms. Thanks to the other reviews i was able to make an informed purchase, get the Capilene 4's.

A Gift for my Brother
My brother called these the best and warmest he's owned. Given his aversion to cold weather, that's a high compliment.