Knix Period Underwear Market Report: Sales Volume, Market Share, Leading Brands & Market Trends
Knix Period Underwear sales on Amazon US totaled 67,650 units in July 2026 (▼ 1.2% vs. the prior month), generating an estimated $1,604,067 in revenue across the 50 top-ranked ASINs for this search term. Demand is heavily concentrated at the top of the ranking — the ten best performers capture 76.9% of unit volume and 71.7% of revenue, while a typical listing is priced at $28.91. The keyword itself pulled 30,833 Amazon queries over the same period (▼ 19.8% MoM).
Zooming out to the 12-month window ending July 2026, the knix period underwear Top 50 moved 621,450 units and $14,006,641 in cumulative sales — an average of 51,788 units and $1,167,220 per month. Monthly throughput topped out at 68,050 units in June 2026 and dipped to 34,150 in May 2026, leaving the latest reading 43.6% higher than August 2025.
Knix Period Underwear Sales Trend (Trailing 12 Months)
Based on the top 50 ASINs by monthly sales for this keyword
2025/08
2025/09
2025/10
2025/11
2025/12
2026/01
2026/02
2026/03
2026/04
2026/05
2026/06
2026/07
Monthly Sales 2026/07
67.7K
▼ 1.2% MoM
Monthly Revenue 2026/07
$1.6M
▲ 0.2% MoM
Top 10 Market Share 2026/07
76.9%
Knix Period Underwear Market Share & Sales Concentration on Amazon US — July 2026
The most-sold knix period underwear listing on Amazon US in July 2026 is ASIN B08VCP6QLD (Brand: Always), which sold 10,000 units at $15.98 apiece — equal to 14.8% of every unit tracked in this report.
The Top 10 ASINs account for 52,000 units and $1,149,960 in July 2026 — 76.9% of unit volume and 71.7% of revenue among all 50 ranked ASINs in this report.
Sales Volume of Top ASINs for 'Knix Period Underwear' on Amazon
July 2026
Is 76.9% Top 10 share highly concentrated?
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Top 5 Volume Share breakdown
B08VCP6QLD
Always Always ZZZ Overnight Disposable Period Underwear for Women Small/Medium, 360° Coverage for Worry-Free Nights, 14 Count (2 Packs of 7)
10K
▲ 0.0%vs. prior month
$159.8K
latest month
12-month trend
B0B834SHYC
Rael Rael Disposable Period Underwear, Organic Cotton Cover (Size S-M, 20 Ct) | Leak Locker, Unscented, Extended Coverage for Women, Period Essentials, Postpartum Essentials, Feminine Care
10K
▲ 0.0%vs. prior month
$269.9K
latest month
12-month trend
B0B836FZFB
Rael Disposable Period Underwear, Organic Cotton Cover (Size L-XL, 20 Ct) | Leak Locker, Unscented, Extended Coverage for Women, Period Essentials, Postpartum Essentials, Feminine Care
9K
▼ 10.0%vs. prior month
$250.2K
latest month
12-month trend
B0CSTCH3WZ
Always Always ZZZ Overnight Disposable Period Underwear for Women Extra Large/2LX, 360° Coverage for Worry-Free Nights, 14 Count (2 Packs of 7)
8K
▲ 0.0%vs. prior month
$127.5K
latest month
12-month trend
B091JGY2YP
Rael Disposable Period Underwear, Organic Cotton Cover (Size S-M, 12 Ct) | Leak Locker, Unscented, Extended Coverage for Women, Period Essentials, Postpartum Essentials, Feminine Care
7K
▲ 16.7%vs. prior month
$134.3K
latest month
12-month trend
B0CMF2H5FH
Hanes Women's Comfort, Period. Underwear, Bikini Period Underwear, Super Leaks Period Underwear, 3-pack
2K
▲ 0.0%vs. prior month
$40.8K
latest month
12-month trend
Unlock to view all Top 50 ASIN competitors and their sales contributions
Best Knix Period Underwear Brands on Amazon US — Top 3 Brand Sales Concentration (July 2026)
Rael is the best-performing knix period underwear brand in July 2026, moving 26,000 units across 3 ASINs for 50.0% of Top 10 volume. Always follows with 18,000 units (34.6%), ahead of Hanes on 3,000 units (5.8%).
With 6 brands splitting the Top 10 and 90.4% 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 $10.23 to $24.72, which frames the price band a competing listing has to justify.
Brand share of Top 10 volume
Rael
3 ASINs in Top 10
50.0%
Units
26K
Revenue
$654.4K
Avg. price
$24.72
B0B834SHYC
$26.99·★4.7·5.9K revsRael Rael Disposable Period Underwear, Organic Cotton Cover (Size S-M, 20 Ct) | Leak Locker, Unscented, Extended Coverage for Women, Period Essentials, Postpartum Essentials, Feminine Care
Units sold10KB0B836FZFB
$27.99·★4.7·5.9K revsRael Disposable Period Underwear, Organic Cotton Cover (Size L-XL, 20 Ct) | Leak Locker, Unscented, Extended Coverage for Women, Period Essentials, Postpartum Essentials, Feminine Care
Units sold9KB091JGY2YP
$19.18·★4.7·5.9K revsRael Disposable Period Underwear, Organic Cotton Cover (Size S-M, 12 Ct) | Leak Locker, Unscented, Extended Coverage for Women, Period Essentials, Postpartum Essentials, Feminine Care
Units sold7K
Always
2 ASINs in Top 10
34.6%
Units
18K
Revenue
$287.3K
Avg. price
$15.96
B08VCP6QLD
$15.98·★4.5·8.5K revsAlways Always ZZZ Overnight Disposable Period Underwear for Women Small/Medium, 360° Coverage for Worry-Free Nights, 14 Count (2 Packs of 7)
Units sold10KB0CSTCH3WZ
$15.94·★4.5·8.5K revsAlways Always ZZZ Overnight Disposable Period Underwear for Women Extra Large/2LX, 360° Coverage for Worry-Free Nights, 14 Count (2 Packs of 7)
Units sold8K
Hanes
2 ASINs in Top 10
5.8%
Units
3K
Revenue
$50.4K
Avg. price
$10.23
B0CMF2H5FH
$10.89·★4.1·4.2K revsHanes Women's Comfort, Period. Underwear, Bikini Period Underwear, Super Leaks Period Underwear, 3-pack
Units sold2KB08GSTQP39
$9.57·★4.3·4.4K revsHanes Women's Comfort, Period Underwear Pack, Light Leaks Period Panties, Light Protection Underwear, 3-Pack
Units sold1K
Trending Knix Period Underwear Products — Growth Leaders & New Top 10 Entrants
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: B0BPM2ZGQ3 booked 1K units at $30.95, with ▲ 233.3% MoM change. On the growth side, B0BWHJF5WV leads positive momentum with ▲ 100.0% MoM growth on 2K units, with B0FKNHP9KH close behind at ▲ 100.0% MoM on 200 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.
B0BPM2ZGQ3
Heavy Flow Period Swimwear for Teens & Women
Price
$30.95
Rating
4.5
Reviews
1K
Latest month sales
B0BWHJF5WV
Teens Girls Period Underwear Kids Period Panties Menstrual Leakproof Protective Underwear for Teens Cotton Briefs
Price
$26.99
Rating
4.4
Reviews
1.7K
Latest month sales
B0FKNHP9KH
Always Always ZZZs Disposable Period Underwear, Size S/M, Absorbs 5X More Than an Ultra Thin Overnight Pad, Comfortable Sleep Worry-Free Nights 26 Count
Unlock to view ASIN details and product titles
Price
$37.11
Rating
4.5
Reviews
8.5K
Latest month sales
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