Waterproof Shower Curtain Liners Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

BigFoot is the best-performing waterproof shower curtain liners brand in July 2026, moving 100,000 units across 1 ASIN for 28.6% of Top 10 volume. Barossa Design follows with 80,000 units (22.9%), ahead of Mrs Awesome on 60,000 units (17.1%).

With 8 brands splitting the Top 10 and 68.6% 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 $4.55 to $9.99, 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. On the growth side, B0G52GZ46L leads positive momentum with ▲ 100.0% MoM growth on 2K units, with B07BPZT63P close behind at ▲ 100.0% MoM on 2K 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.