How to Know If Your Period Underwear Size Is Wrong (And Fix It)

Getting sizing exactly right on a first order isn't guaranteed, and the signs that it's off aren't always obvious right away — nothing dramatic happens, it just doesn't feel quite right, which makes it easy to blame the product rather than the fit.

Signs it's sized too small

Digging in at the waistband or leg openings, visible red marks after wearing, or a feeling of the gusset pulling tight rather than sitting flat are the clearest signs. Leaking near the leg openings specifically — rather than through the front or back — is also often a sizing issue rather than an absorbency one, since a too-tight fit can push fluid sideways rather than letting the gusset absorb it properly.

Signs it's sized too large

The gusset sitting loosely or shifting out of place during the day is the main sign, along with the waistband feeling like it needs constant adjusting. Leaking through the front or back, rather than at the edges, points more often to sizing being too loose than to a flow that's exceeded absorbency — a properly fitted pair should hold its position without needing to be checked.

How to actually check

Measure at the waist and hip rather than relying on your usual clothing size, since gusset position depends on body measurements more than overall garment size. Our size guide has the exact measurement ranges for each size — if you're between two, size down. The gusset has to sit flush against you to work, and a waistband with slack lets it shift out of place, which is exactly the front-and-back leaking described above.

If you've already ordered the wrong size

This is common enough on first orders that it's a normal part of the process, not a failure on your part — our First-Pair Fit Guarantee covers one free size exchange on your first order, and our returns and exchanges policy covers how to swap for the right size.

The bottom line

Most sizing issues show up as a specific, describable feeling — digging in, shifting, or leaking at a specific spot — rather than a vague sense that something's wrong. If you can name which of these you're experiencing, it usually points directly to sizing up or down.