The Montane Terra Pant is by far the lightest, most breathable, wind resistant and fast drying pair of technical outdoor trousers i have ever worn. I would not substitute them for any other pair. I have been solidly sporting the Montane Terra pant now for 4 years. And through solid outdoor use i have only had to buy one additional pair, purely because I grew out of my first pair, (which my sister now wears). And although the fairly expensive price tag, you pay for a lasting, quality pair of trousers which I feel, are indispensable. They are ultra practical and breathable, thanks to a zip feature on either side off he trouser allowing a controlled airflow through a mesh net system. Although may be a bit light for winter mountaineering, a pair of under thermals do the trick, as i tested out on "Jacobs Ladder", (Cairngorm). The trouser will go from drenched to bone dry in a matter of 15-20 minutes, (so river crossings,etc, are no longer a problem). They weigh nothing, and are extremely durable thanks to the reinforced knee and backside patches. All of this is topped of buy a sleek modern design which looks great out in the hills, mountains or Corries. What a piece of kit!