The REI Headwind pants are excellent in every way. I've had a pair for 4 years and they show no signs of wear anywhere on them. At least 200-300 days in them, probably more. They're not tight, but not real loose either. The fronts are windproof. No chance of getting them caught up in your crank/chain. I wear normal biking shorts under them, and if it gets below about 35, I also add a pair of long underwear under them. I'd say they're good to 20 degrees like that and that's as low as I go.