How to test whether leggings stay opaque when you squat
Key takeaways
- The test has to be done in the size you wear, not a sample size.
- Daylight or a light behind you is what makes thinning visible.
- A brand claim is not verifiable from a product page.
- We do not use the phrase "squat proof" unless an opacity test was recorded.
Why a specification will not answer it
Fabric weight helps, a doubled seat panel helps, and a solid dark colour helps, but none of them settle it. The amount the fabric has to stretch on your body is part of the equation, and no product page knows your measurements.
The test, step by step
Wear the leggings in your usual size. Stand in daylight or place a lamp behind you. Squat fully, then bend forward from the hip. Look in a mirror or ask someone to look. Repeat after twenty minutes of wear, because a knit relaxes and thins slightly as it warms.
What to do with the answer
If they thin at full squat but not when bending, they are fine for walking and travel and not for a class. If they thin in both, size up or choose a heavier fabric rather than a different colour of the same style.
Why we do not print the phrase
Our publishing tool blocks the phrase "squat proof" unless a recorded opacity test exists for that product in our database. If you see an opacity level on a product page here, a person put the garment on and looked.
Related questions
- squat test leggings
- opacity test leggings at home
- do black leggings stay opaque
Related guides
Frequently asked questions
- Can I test leggings before buying them?
- Not properly. You can check fabric weight, seat construction and colour, but the definitive test needs the garment on your body in your size.
- Does the test change after a few washes?
- It can. Elastane degrades with heat, and a pair washed hot and tumble dried will stretch further to fit, which brings the thinning point closer.
- Why does JEGINS Fit avoid the phrase "squat proof"?
- Because it is a test result, not an adjective. Our publishing tool refuses the phrase unless a recorded opacity test exists for the product.
Sources
- Leggings - Wikipedia
Background reference for the definitions used in this guide.
Accessed September 1, 2026
- JEGINS Fit testing methodology
Our published editorial standard for the figures used in this guide.
JEGINS Fit · Accessed September 1, 2026
Scope and limits of this guide
This guide describes what we have measured or sourced. It does not cover every brand, and body measurements vary: use it as a starting point and check the specific product page for its evidence level before buying.