A booster is an extra layer you add when the brief you already wear is not quite enough. NorthShore EternaDry Booster Pads are listed with adhesive, in a small size, 4 count, at $6.99 when this article was written. The notes call it a booster insert with an adhesive strip meant to sit inside protective underwear or a brief. The listing details are the ones current when the article was written. Check the Amazon page before you buy. This is shopping information, not medical advice. We did not pour fluid on a sample or publish a rating.
Four is a trial quantity. You can see whether the insert stays where you stick it, and whether the extra layer is worth the bulk, before you buy a larger case of anything. The title says small. The notes we used do not give length and width, so do not invent a measurement from the word small. Read the live page if you need inches before you order.

Adhesive, a small size, and a 4-count price
The adhesive strip is the part that keeps the booster on the inside of another product. Press it onto the core of a brief or of protective underwear, on a dry surface, before you put that garment on. A strip stuck to damp cloth lets go. Smooth it with your hand so the booster lies flat. A fold down the middle becomes a channel, and fluid follows a channel toward the edge.
Plan on that pairing. The listing sells this as an insert inside protective underwear or a brief. Wearing the small piece by itself in ordinary underwear is outside the use the page describes. There is no waistband on a booster. The outer product has to hold it against the body and catch what the booster does not.

At $6.99 for 4, the pack price divided by the count is about $1.75 a booster. That math uses only the price we saw. It is not a coupon. Four boosters is four uses if you add one each time, or two days if you use two. The low pack price is what makes a 4-count useful as a first try. It is a poor way to stock a month. Amazon changes prices, so confirm $6.99, the word small, and the count of 4 on the live page.
The listing is here: the small adhesive booster, 4 count, on Amazon.
Adding capacity inside a brief you already use
Use the booster with a brief or pull-on you already know how to fit. The insert adds a layer in the wet zone. It does not resize the outer garment, and it does not fix leaks at a leg or up the back if those openings are the problem. If the brief gaps at the thigh, look at size and fit of that brief. A small pad in the center will not close a gap at the leg.
Put the booster on while the brief is still off the body, or while it is open if you use a tab style. Trying to slide an adhesive piece into a pull-on you are already wearing is fiddly and usually crooked. Caregivers often find it easier to place the booster, then bring the brief up, during a change you were going to do anyway.
One booster per change is the straightforward reading of a 4-count. Stacking two is something the notes we used do not discuss, so do not assume the adhesive is meant to stick booster-to-booster. If you need much more capacity every night, a heavier brief may be the clearer buy. This 4-count lets you test the add-on idea first.
Change the pair when the core feels wet. Extra capacity can tempt you to wait. Skin does not enjoy that wait. Clean and dry the skin before the next brief. If a rash shows up, that is a question for a clinician, not for another insert.
A comparison of booster pads is on the site at the booster pad comparison. That page sets more than one insert side by side. This review stays with the small 4-count. Check the Amazon page again before you buy. Size wording, adhesive, count, and price were current when the article was written.