Best overallOne pair of trousers for the whole trek
prAna Stretch Zion Pant
Tough, stretchy and dry fast enough to wash in a bucket — they are not warm, so above 4,000 m you are wearing a base layer underneath.

Columbia Silver Ridge Convertible Pant
Nylon, UPF 50, zip-off legs
The zip-off is genuinely useful when you leave a 25 °C valley and arrive somewhere freezing; the zips sit right where a pack hip-belt or a knee bends, and some people never stop noticing.
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Do not buy this if: Cold treks that never get hot. Buy a single warm pair instead of a compromise.
Not every route needs it. These are the ones where our guides would put it on your list.
Everything else we recommend in trousers & shorts, including the ones we think suit a different trekker.
Best overallprAna Stretch Zion Pant
Tough, stretchy and dry fast enough to wash in a bucket — they are not warm, so above 4,000 m you are wearing a base layer underneath.