Waterproof Mattress Protector King Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

BEDLORE is the best-performing waterproof mattress protector king brand in July 2026, moving 60,000 units across 3 ASINs for 46.9% of Top 10 volume. Utopia Bedding follows with 58,000 units (45.3%), ahead of PlushDeluxe on 10,000 units (7.8%).

With 3 brands splitting the Top 10 and 100.0% of volume sitting with three of them, this is a concentrated shelf — the leaders hold multiple listings or one very high-velocity ASIN, so a new entrant competes against established review moats rather than an open field. Average selling prices among the leaders run from $19.24 to $39.99, which frames the price band a competing listing has to justify.

Based on July 2026 data, this shortlist surfaces the two kinds of ASIN worth keeping an eye on — the ones that just broke into the Top 10, and the ones growing fastest month over month. Specifically, one ASIN forced its way in: B01MRL6HQW booked 9K units at $19.99, with ▲ 28.6% MoM change. On the growth side, B0G3YK3LMR leads positive momentum with ▲ 1900.0% MoM growth on 1K units, with B0C1NQZDYH close behind at ▲ 100.0% MoM on 20K units.

The two signals carry different weight. A fresh entrant means share has already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date. A steep growth rate works as the earlier warning: it marks demand that is still compounding, usually a month or two before the ranking catches up to it.