If your favorite jeans come out of the washing machine covered in strange ripples, puckering, or wavy lines, don’t panic. In many cases, the fabric hasn’t been permanently damaged. Denim is often made primarily from cotton, which naturally reacts to heat and moisture. When different sections of the jeans shrink at slightly different rates, especially around seams and reinforced areas, the fabric can buckle and create those unusual patterns.

Another reason may be the tension created during manufacturing. Different sections of a pair of jeans are stitched under varying levels of tension, and those stresses can become more noticeable after washing. Stretch denim can be even more sensitive because fibers such as elastane or spandex react differently from cotton, sometimes causing areas of the fabric to twist or lose their original shape.

Your washing habits can also contribute to the problem. Overloading the machine gives jeans less room to move freely and can cause them to twist, tangle, and become distorted. Washing them with heavy clothing or using an aggressive cycle may put additional stress on the denim, making wrinkles and ripples more noticeable.

Drying is another important factor. High temperatures can cause cotton fibers to shrink unevenly, potentially making existing ripples worse. Whenever possible, air-drying your jeans is a gentler option that can help them maintain their shape. Removing them from the washer promptly and smoothing the fabric before drying can also help minimize unwanted creases.

To keep your jeans looking their best, turn them inside out and wash them in cold water using a gentle cycle. Avoid cramming too many clothes into the machine, and limit exposure to high heat. With a little extra care, you can reduce twisting, uneven shrinkage, and those frustrating ripples that appear after laundry day.