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Most period underwear leaks the moment you actually move in it. 🏃‍♀️ You know the feeling. You're two miles into a run, or halfway through a yoga flow, and something shifts. You're suddenly spending more energy thinking about what's happening down there than focusing on what's in front of you. A fitness coach in London decided to put an end to the guesswork. She spent three months testing seven of the most popular seamless period underwear brands — running, yoga, spinning — specifically to find out which one actually holds up when your body is moving. The results weren't what she expected. One pair was genuinely invisible under tight leggings. No VPL, no camel toe, no shifting during lunges or forward folds. It stayed dry throughout sweaty sessions and didn't move once across a full 10k run. The full comparison — all seven brands ranked, with honest pros and cons for each — is in the guide below. 👇 If you've ever had to cut a workout short, double up on protection, or just wonder whether period underwear is actually worth it for sport, this one's worth a read.