Is period swimwear profitable to sell on Amazon United Kingdom?

The niche generates £178K/yr across 94 tracked products. 0 of 24 products launched in the last 360 days are still selling. 90-day search growth is +171.4%. Flapen's verdict: Worth a look (67/100).

How competitive is the period swimwear niche?

21 brands and 33 sellers compete. The top 5 products take 24% of clicks and top 5 brands hold 56% of demand.

What do buyers complain about in period swimwear?

Top complaints mined from reviews: Size-Overall, Value For Money, Quality-Overall. The return rate is 3.4%.

When does demand for period swimwear peak?

Demand peaks in Jun–Jul–Aug; the busiest month runs 11.1× the quietest.

What does it cost to enter the period swimwear niche?

Listings span £5.66–£46.42; the average listing price is £15.80 (sweet spot $15–$100). The average incumbent carries 503 reviews — the moat a new listing must climb.

period swimwear

Worth a look

Shows demand growing +171.4% this quarter, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Growth

Incredible+171.4%

90-day search growth — must beat 0% to launch

Competition

Great24%

top-5 click share — an open shelf

Brand share

Great56%

top-5 brand share — no brand owns this niche

Avg price

Great£15.80

avg listing price — sweet spot $15–$100

Price range

Great£5.66–£46.42

cheapest to priciest tracked listing — scored on the share inside $15–$100

Review moat

Good503.17

avg incumbent reviews — the moat a new listing must climb

Quality gap

Good4.3★

avg incumbent rating — lower means beatable quality

Returns

Okay3.4%

return rate — above 5% kills the launch gate

Market size

Okay£178K

£178K/yr · 750K searches

Conversion

Bad1.5%

search→purchase rate — share of searches ending in a sale

Signals Trending No Dominant Brand

According to Flapen's Amazon United Kingdom niche tracking, period swimwear is a £178K/yr Amazon United Kingdom market (750K searches/yr). The top 5 brands hold 56% of demand. Demand peaks in Jun–Jul–Aug. Verdict: Worth a look — 67/100.

Data updated Jul 23, 2026 · scored weekly · How we score niches

period swimwear market data

Units sold / yr: 10K–13K; avg 100–250/product
Revenue / yr: £158K–£198K; units × avg price
Conversion rate: 1.5%
Avg BSR: #109
Page quality: 0%
Prime: 100%
Sponsored: 90%
Out of stock: 2.2%
Avg brand age: 30 months
Avg seller age: 185 days

Competition & brand share

Clicks spread well past the top 5 (24% combined) — an open shelf where new products get seen.

Brands

21 falling

Sellers

Top-5 brand share

56%

Top 20: 100%

Top-5 click share

24%

Top 20: 56%

Open market

38%

Leovqn15%
OVRUNS12%
Modibodi11%
ZVZK10%
Runmeihe9%
WUDEUI7%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +171.4% search growth over the last 90 days.

Peak months: Jun, Jul, Aug · busiest ÷ quietest = 11.1×

Open Trend

Top period swimwear search terms

period swimwear373K/yr +197.8%1.0% conv.
period swimwear for teens108K/yr +149.5%1.4% conv.
period swimwear for women57K/yr +63.7%0.8% conv.
period bikini bottoms28K/yr +389.0%2.8% conv.
teenage period swimwear10K/yr +590.8%0.5% conv.
teen period swimwear20K/yr +177.1%0.9% conv.
period swimwear for girls30K/yr +21.5%0.6% conv.
period swimming costume17K/yr +60.7%0.2% conv.
period bikini10K/yr +336.3%0.8% conv.
period swimsuit14K/yr +124.1%0.3% conv.

All search terms

Top period swimwear products on Amazon

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 24 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

ZVZK Period Pants Heavy Flow 30ML Absorbent Women Leak Proof Panty Period Knickers Menstrual Underwear 3 Pack (M Pack of 3)

ZVZK£13.564.2★3,582 rev

OVRUNS Period Bikini Bottoms Low Waisted Leakproof Swimwear Waterproof Menstrual Swim Short for Teens Girls Women Black II XS

OVRUNS£11.134.5★711 rev

JiaYouLC Period Swimwear for Girls Teens Women Leakproof Menstrual Bikini Pants for Swimming Period Swim Bottoms (UK Numeric 6 8 Regular Regular Black-Basic)

JiaYouLC£6.004.3★102 rev

OVRUNS Period Bikini Bottoms Low Waisted Leakproof Swimwear Waterproof Menstrual Swim Short for Teens Girls Women Black II S

OVRUNS£11.004.5★711 rev

WUDEUI Period Bikini Sets for Women 2PCS V Neck High Waisted Tummy Control 4Ply Leakproof Ruched Drawstring Swimwear for Ladies

WUDEUI£15.564.2★22 rev

Newest

by launch date

FLADY Period Swimwear for Girls & Women Black Swimming Costume Women Leakproof Racerback Black Swimsuit with Built-in Menstrual Protection Teen Heavy Flow (UK Alpha S Regular Regular Black)

FLADY£25.0431 rev

5mo ago

FLADY Period Swimwear for Girls & Women Black Swimming Costume Women Leakproof Racerback Black Swimsuit with Built-in Menstrual Protection Teen Heavy Flow (UK Alpha M Regular Regular Black)

FLADY£24.7331 rev

5mo ago

WUDEUI Period Bikini Sets for Women 2PCS V Neck High Waisted Tummy Control 4Ply Leakproof Ruched Drawstring Swimwear for Ladies

WUDEUI£15.5622 rev

6mo ago

Period Pants Swimwear for Women High Waisted 4Ply Leakproof Bikini Shorts Bottoms Built in Briefs and Drawstring Menstrual Swim Shorts for Girls Teens Black

WUDEUI£11.4026 rev

8mo ago

WUKA Teen Period Swimwear Bikini Bottom Leak Proof Reusable Period Bikini Brief Light Flow Swim Pants for Girls Size S Black

WUKA£17.7926 rev

10mo ago

What buyers say about period swimwear

What buyers praise and complain about, mined from review topics.

What buyers love

Size-Overall17%

“The fit is really flattering”

Quality-Overall16%

“they work very well”

Comfort-Overall12%

“Theyre really comfortable”

Advertised Vs Actual Product5%

“As described”

Shape/Style5%

“Its a nice stylish costume”

Material Quality5%

“in the material gives it a comfortable”

Exercise/Sports Suitability3%

“This is perfect for being able to still go for a swim and beach”

Water Resistance3%

“Being able to swim freely is a great comfort”

Value For Money3%

“Great for the price”

Soft Feel3%

“The fabric feels soft”

What buyers complain about

Size-Overall21%

“Fit wasnt great”

Value For Money5%

“somewhat expensive for what it is”

Quality-Overall5%

“Poor Quality”

Comfort-Overall5%

“slightly uncomfortable”

Water Resistance4%

“It not waterproof at all”

Absorbency4%

“I was a bit unsure about ordering these because you never know with sizing and absorbency claims,”

Material Quality3%

“Avoid - Very cheap fabric”

Durability2%

“Did not survive the purpose”

Smell2%

“instantly hit with a horrid smell”

Functionality-Overall2%

“Dont work”

Top return reasons

Size-Overall77%

Length3%

Quality-Overall2%

Material Quality2%

Thin2%

Chest Fit2%

Shape/Style2%

Waist Fit1%

Advertised Vs Actual Product1%

Transparency1%

Common questions

Is period swimwear profitable to sell on Amazon United Kingdom?: The niche generates £178K/yr across 94 tracked products. 0 of 24 products launched in the last 360 days are still selling. 90-day search growth is +171.4%. Flapen's verdict: Worth a look (67/100).
How competitive is the period swimwear niche?: 21 brands and 33 sellers compete. The top 5 products take 24% of clicks and top 5 brands hold 56% of demand.
What do buyers complain about in period swimwear?: Top complaints mined from reviews: Size-Overall, Value For Money, Quality-Overall. The return rate is 3.4%.
When does demand for period swimwear peak?: Demand peaks in Jun–Jul–Aug; the busiest month runs 11.1× the quietest.
What does it cost to enter the period swimwear niche?: Listings span £5.66–£46.42; the average listing price is £15.80 (sweet spot $15–$100). The average incumbent carries 503 reviews — the moat a new listing must climb.