I've had a pair of these for about 3 seasons. I've tended to often leave them at home in place of my hard-shells, but recently completed the Haute Route from Chamonix to Zermatt over 8 LONG consecutive days of touring and mountaineering and decided to go with these for the stretch, comfort, and breathability. They performed fantastically for this purpose. They're definitely not designed for super cold days, sitting on chairlifts, or rain; but when moving far and fast, these were great. Not wind-proof, but resistant enough, not water-proof, but fine in snow or a light shower. I wore these over a mid-weight smartwool layer and when moving, they were great to the low teens in temps and perfectly fine in heavy wind. I highly recommend for an active pant. Pack these with a pair of waterproof Helium pants for when weather takes a harsh turn and you're golden.