Underwire Tankini Tops For Women Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

Daci is the best-performing underwire tankini tops for women brand in July 2026, moving 1,200 units across 3 ASINs for 26.7% of Top 10 volume. MODLILY follows with 800 units (17.8%), ahead of ROSEWE on 700 units (15.6%).

With 8 brands splitting the Top 10 and 60.0% 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 $31.32 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, 3 ASINs forced its way in: B0F7XD2K7G booked 500 units at $36.99.

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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.