Some boosters are meant to hold fluid for a while and then let the rest move into the garment underneath. Tranquility TopLiner Booster Pads are listed as a super 15 by 4.25 inch pad in a 200-count case, at $62.99 when this article was written. The page says this flow-through booster fills first and then passes extra fluid into a brief or pull-on, with an adhesive strip and a latex-free cloth-like cover. The listing details are the ones current when the article was written. Check the Amazon page before you buy. This is not medical advice, and we did not time a fill or publish a score.
Flow-through is the shopping point, so read it the way the page states it. The booster takes fluid first. Extra fluid is supposed to pass into the brief or pull-on under it. That only happens if the brief or pull-on is actually there. Used alone in regular underwear, the piece has nowhere to pass that extra fluid, and the listing is not describing that use.

Fifteen by 4.25 inches, a cloth-like cover, and 200 pads
The size on the title is 15 inches by 4.25 inches. That is a long, narrow strip. Fifteen inches will run past the core of some briefs and stop short of others, so lay a tape on the brief you plan to boost before you assume the length matches. The 4.25-inch width covers a central channel. It does not cover hip gathers or the full seat.
The notes name two construction details: an adhesive strip, and a latex-free cloth-like cover. Adhesive is there to keep the booster on the core of the outer product. Press it on while that core is dry and flat. Latex-free matters if latex has bothered skin before. Cloth-like describes the cover in the notes. It does not mean the booster will feel like a dry washcloth at the end of a long night.

The case count is 200. At $62.99, dividing the case price by 200 is about 31 cents a booster. That arithmetic uses only the price we saw. One a day is 200 days. Two a day is 100 days. A case this large makes sense when you already boost every change. It is a lot of product to store if you are only curious. Keep the case dry.
The listing is here: the 15 by 4.25 inch booster, 200 count, on Amazon.
An inner layer for a brief or a pull-on
Place the booster on the core of the brief or pull-on, sticky side to that core, cloth side toward the body. Do this before the garment is on, or while a tab brief is open. Fishing a 15-inch strip into a pull-on you are already wearing tends to fold it. A fold works against the flow-through design. Fluid follows a crease instead of spreading through the pad.
The word super sits in the title next to the size. Treat it as a line name. The notes we used do not give a milliliter rating or an hour claim, and we will not add one. The behavior they do describe is fill first, then pass extra fluid outward into the brief or pull-on. If the outer garment is already near its limit, passing more fluid into it will not create room that is not there. Boost a brief that still has capacity left.
Two hundred boosters is a supply you buy on purpose. One per change is the simple plan. The notes do not describe stacking several boosters, so do not assume one booster is meant to stick onto another booster’s cover. If nights are still too heavy with one insert, look at the brief itself on a separate shopping trip.
Change when the pair feels wet. A flow-through layer can hide wetness until the outer brief is involved, so check sooner than you think on the first few uses. Clean and dry the skin. A rash is for a clinician. Another adjective on a case of pads is not care.
A longer look at booster pads is on the site at the booster pad comparison. That page looks at more than this 200-count case. This review does not. Reread the Amazon listing before you buy. Size, flow-through wording, adhesive, the latex-free cover, count, and price were current when the article was written.