I wear my Under Armour running (coldgear) pants for riding (just started). They work excellent. I wear my PI riding shorts underneath. They do not give me an issue with the chainring. I am a runner, so all of my coldweather clothes are being used for bike riding and they work excellent (went on a 22 miler the other day in 35-40 degree weather with 15-25mph winds. although it was tough to ride in the wind, the clothes I had on worked quite well.