The extra-large core also provides excellent coverage in the front and rear even for side sleepers. MEGAMAX USA Briefs, 10PK With a near limitless absorbency and quick wicking core, NorthShore MegaMax Briefs are the total package when it comes to protection.. The oversized absorbent core is the most absorbent at NorthShore & compares to other brands with ISO max absorbency of 6500ml.