Assurance Underwear For Women Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

Depend is the best-performing assurance underwear for women brand in July 2026, moving 79,000 units across 5 ASINs for 53.0% of Top 10 volume. Always Discreet follows with 60,000 units (40.3%), ahead of Amazon Basics on 10,000 units (6.7%).

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 $11.36 to $38.28, 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, 2 ASINs forced its way in: B0C3KPVZ1Z booked 10K units at $49.69, with ▲ 11.1% MoM change. On the growth side, B0198T85CS leads positive momentum with ▲ 66.7% MoM growth on 500 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.