There are a few. Higher upfront cost since you'll want several pairs to cover a full cycle. More involved care, with cold-water rinsing, gentle wash, and air-drying to keep the absorbent layers working. Capacity limits on heavy days, where you may want a backup product like a pad or tampon. Slightly damp feeling for some wearers compared to internal products. Logistics of changing on the go, since you carry the used pair home in a wet bag. And material concerns: some brands have been flagged for PFAS, so brand transparency matters. For most people, matching the absorbency to your flow and changing on schedule reduces most of these. Heavy days may still need backup.
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