For 5 days and 4 nights I wore the Icebreaker Men's Bodyfit260 Mid-Weight Leggings
From an insulating perspective the most I can say is that I had no complaints. This wasn't a scientific experiment and I had other layers on top of the base - so I can't really say whether it was better than the polypro or not.
From a comfort perspective however, I'm going to have to proclaim the Icebreakers the winner. On longer trips comfort really takes on a new significance. After a couple days of wearing the same item you start to feel all the little things you might otherwise not notice. This is especially the case with fitted items. Tags, seams and fabric will start to take a toll on your skin.
After a few days in polypros my skin and leg hairs will become sensitive to the fabric. I think the sensation is akin to "hat hair ache": when you wear a hat for an extended period your hair can hurt/tingle when you finally remove it. It's not really something I notice it during periods of activity, but when I get into my sleeping bag at the end of the day I can feel my skin ache just a little. With the Icebreakers I didn't have this problem. I can only assume that the fabric didn't cause my leg hairs to bend and snag in the same way that I assume the polypro does. This was a major plus in my opinion. At the end of the day there are no prizes for being uncomfortable.
When we got back to our Anchorage hotel I decided to give them a "sniff test". Five days of continuous sweating and drying left me smelling horrible, however the Icebreakers smelt as if they were right out of the box. My polypros would have been a petri dish compared to these.
I was also please with their durability: no snags, pulls or loose threads. Back home I ran them through the wash and they snapped back into shape without any issues. Frankly, they could have gone right back into the box and sold as new. So I'm quite pleased with their durability.
I did some in-store comparisons with a few different brands - most notably Ibex. At the time of this writing I was not impressed with the durability of the Ibex clothing. Just trying them on in the store I could feel threads breaking and it looked as if it would easily snag and tear. In their defense however, the ones I tried on were slightly lighter weight than the Icebreakers - but I don't feel that should have left threads breaking. They might be fine to wear around town, but I wouldn't use them on a long term outing.
In the end, while I don't think the Icebreaker product has significant benefits over the polypro for short trips (1-2 days), I will undoubtedly be using them for any extended trip. The comfort and odor-resistance absolutely sold me.
