Norrona Trollveggen Flex1 Pant

Backcountry.com says:
It's so nice when the alpine is warm enough for you to rid those bulky layers and replace your winter sleeping bag with a lighter, more compact option. You still have to worry about inclement weather though, which is why you wear the Norrona Men's Trollveggen Flex 1 Pant. It's light and breathable for the ascent, stretchy enough for the difficult parts of the climb, and weather-resistant enough to shed light moisture and block brisk breezes. There are hook-and-loop tabs at the waist to give a solid fit with or without a belt, and boot hook prevent snow and debris from sneaking up there when you're in the middle of a rain shower.