There’s nothing worse than pulling your favorite jeans out of the wash and noticing they don’t look the same anymore. Instead of that clean, smooth fit you love, you’re left with weird ripples, puckering, or uneven texture. It can feel like your jeans have completely changed shape overnight.

Most modern jeans aren’t just made from cotton anymore. They often include stretch materials like elastane or Lycra, which make them more comfortable and form-fitting. But while these fibers improve flexibility, they’re also more sensitive to heat and stress.

High temperatures—especially in dryers—are one of the biggest causes of rippling. Heat weakens the elastic fibers, causing them to lose their ability to bounce back. When that happens, the cotton and stretch materials stop working together evenly, leading to a wavy or puckered look.

Cotton tends to shrink consistently, but stretch fibers don’t. When they break down unevenly, some areas of the jeans tighten while others stay loose. That imbalance creates visible ripples across the fabric.