Boys Swim Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

Speedo is the best-performing boys swim brand in July 2026, moving 19,000 units across 6 ASINs for 70.4% of Top 10 volume. TYR follows with 4,000 units (14.8%), ahead of OlyPegic on 2,000 units (7.4%).

With 5 brands splitting the Top 10 and 92.6% 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 $9.99 to $14.94, 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: B0D6GPGXGP booked 1K units at $19.98, with ▲ 0.0% MoM change. On the growth side, B011PM4IRC leads positive momentum with ▲ 100.0% MoM growth on 6K units, with B0D1GG76RV close behind at ▲ 100.0% MoM on 100 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.