How often you should wash them: After 4 to 5 wears.
What to know: Durable denim is excellent at masking dirt—which is a good thing, since overwashing can cause jeans to fade and fray. To keep yours looking like new (or “weathered” just the way you want them): Throw them in the washer inside out and use cold water. Avoiding the dryer will help retain color, too.
Exception to the rule: Take them for a spin cycle sooner if they stretch out. Or just toss them in the dryer for 10 minutes (but no more than that). Spandex-heavy “jeggings” (jean leggings) should be washed after every wear so the knees don’t bag.