One 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.
Skip it ifCold-weather trekking as your only leg layer. Add merino bottoms above 4,000 m.
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The rest of the shelf
Best valueZip-off legs for treks that start hot and end cold
Columbia Silver Ridge Convertible Pant
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.
Skip it ifCold treks that never get hot. Buy a single warm pair instead of a compromise.