A little, but way less than people think. Tampons are designed to absorb fluid, so yes, they'll pick up some water if you're submerged for a while, but they don't suddenly fill up like a sponge. The water pressure outside your body actually helps slow leaks while you're in the pool or ocean. Insert a fresh tampon right before swimming so it has full absorbency for your flow, and change it as soon as you're out and dried off, since a wet tampon won't hold up the same once you're back on land. If you're picking a size for swim days, regular or super in organic cotton covers most flows.
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