Long before discovering Riv I've been using wool as my base layer. I'd been hedging on buying new wool tights because of the prices on the ones I could find, and quality issues I've experienced with some of them.
Received these the day I left for a S48H trip with my two daughters in the Colorado Mountains at about 10,000 feet. Damp, cold, post torrential night thunderstorm mornings were toasty despite the 25 degree F. These combined with the MUSA knickers is a great way to handle temp swings from below freezing to 70 in a day.
The knit is tight and solid for a tight, the construction superb, and the weight just right.
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1 of 1 people found the following review helpful:
Good stuff
December 8, 2011
Reviewer:
Mike
from Colorado
I've been wearing wool base layers for cycling and outdoor activities in general for the last 4 years or so and would never go back to synthetics. These particular semi-tights are great for cool to cold weather riding (I use these throughout the winter in CO).
That being said, my only complaint (and this applies to almost all light weight wool layers I have owned) is that they can be somewhat fragile. I've had a pair of these for two years and they have been mended a few times but are now wearing so much in the crotch that I suspect this will be their last season of use. Still, well worth the asking price.
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These are excellent.
December 1, 2011
Reviewer:
John
from Portland, OR
I have two pairs of these and a third pair from a different maker of roughly the same price. These are superior in all respects, most notably, durability. I ride public transit to work every day and standing around in 35 and lower temperatures at 6 a.m. during the fall and winter make these very, very handy. Especially if public transit's heat isn't working right!
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1 of 1 people found the following review helpful:
Not-So-Tights are not Tights
October 14, 2011
Reviewer:
Burt
from Minneapolis, MN
This is an excellent product, but you should note that they are NOT true cycling tights. These are wool underwear, a base layer. I'm keeping mine anyway since they will be useful as a base layer for winter biking and cross-country skiing.
Just Right, Great Price! 
Good stuff