I've had these trousers for about 3-4 years now (so probably a previous version). Loads of washes and they are still OK, but the internal tape is starting to come apart a bit. I find they work in a wide range of temperatures and wear them virtually all year except for summer, or about +15 deg. C. The thigh vent is quite effective.
Shame about the price though. You can buy these for £100 in the UK which is about 160 CAD.