Why Do Leggings Get Baggy at the Knees?

Most likely causes

1. The fabric has limited elastic recovery for repeated deep bending.
2. Heat has damaged elastane over time.
3. The leggings are loose enough that excess fabric collects at the knee.
4. Long-term wear has fatigued fibers or seams.

What to try now

• Let the pair rest between wears and compare recovery after washing.
• Avoid unnecessary high heat if the care label does not allow it.
• Check whether bagging disappears when the garment is freshly put on.

What to look for next time

• A snug but not over-stretched knee fit.
• Good recovery rather than stretch percentage alone.
• Care instructions you can follow without high dryer heat.

This guide explains common garment-fit mechanisms. It cannot diagnose a medical condition or guarantee how a specific product will fit.