Sizing and fit
The one measurement that decides everything here is the hip, and the second is the thigh. A cover that fits at the waist but bites at the leg will leak at the leg.
Measure around the fullest part of the hip with a tape held level, over the brief you actually wear, not over bare skin. An absorbent brief adds real bulk, and a cover chosen without it will sit tight.
Then measure the thigh at the top, close to the body. The first thing the Florith team tells anyone ordering is to measure the thigh, and the ratings on this range say the same thing in a blunter way: the pieces people mark down are almost always the ones ordered a size too small.
If you are between two sizes, the larger one is the safer error. A cover that is slightly loose still holds, because the elastic sits above the leak. A cover that is slightly tight rolls at the thigh and opens a channel.
Which sizes exist, and where
What a cover does not do
Florith covers manage leaks. They do not treat the cause of them, and what follows is general guidance, not medical advice. If leaking is new, painful, bloody or getting worse, that is a conversation for a clinician, not a purchase.
“Even after treatment, some people still leak urine from time to time.”
“Strong pelvic floor muscles hold in urine better than weak muscles.”
“As a general rule, the simplest and safest treatments should be tried first.”