Flow-Through Design for Extended Leak Protection. A Booster adds absorbency to a disposable undergarment. When filled with liquid, it flows through into the diaper or brief. NorthShore EternaDry Booster Pads have higher absorbency, more sizes & lower cost than most other brands. Slim, soft & super-absorbent. Has adhesive backing that holds it in place and enables you to stack multiple boosters.