---
title: "Period Swimwear — £178K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/fashion/period-swimwear"
last_updated: "2026-07-31T16:53:52.420Z"
locale: en
meta:
description: "Niche score 67/100 · £178K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 67/100 · £178K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Period Swimwear — £178K/yr Amazon UK Niche (2026) - Flapen"
---
# **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.
Market size 36Growth 97Conversion 19Competition 91Returns 45Price range 77Avg price 77Brand share 79Review moat 75Quality gap 73
**Growth**
**Incredible****+171.4%**
90-day search growth — must beat 0% to launch
**Competition**
**Great****24%**
top-5 click share — an open shelf
**Brand share**
**Great****56%**
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**
**Good****503.17**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Good****4.3★**
avg incumbent rating — lower means beatable quality
**Returns**
**Okay****3.4%**
return rate — above 5% kills the launch gate
**Market size**
**Okay****£178K**
£178K/yr · 750K searches
**Conversion**
**Bad****1.5%**
search→purchase rate — share of searches ending in a sale
**Signals**[** Trending**](https://flapen.com/research/niches?market=uk&signal=trending "Search growth > 100% (90d)") [** No Dominant Brand**](https://flapen.com/research/niches?market=uk&signal=no_dominant_brand "Top brand's click share < 20%")
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 ~~](https://flapen.com/research/methodology)
## **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**
**33**
**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.
45K35KSpike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Jun, Jul, Aug · busiest ÷ quietest = 11.1×
[**Open Trend **](https://flapen.com/research/uk/fashion/period-swimwear/trend)
## **Top period swimwear search terms**
- **period swimwear**373K/yr+197.8%1.0% conv. - **period swimwear for teens**108K/yr+149.5%1.4% conv. - **period swimwear for women**57K/yr+63.7%0.8% conv. - **period bikini bottoms**28K/yr+389.0%2.8% conv. - **teenage period swimwear**10K/yr+590.8%0.5% conv. - **teen period swimwear**20K/yr+177.1%0.9% conv. - **period swimwear for girls**30K/yr+21.5%0.6% conv. - **period swimming costume**17K/yr+60.7%0.2% conv. - **period bikini**10K/yr+336.3%0.8% conv. - **period swimsuit**14K/yr+124.1%0.3% conv. [**All search terms **](https://flapen.com/research/uk/fashion/period-swimwear/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.
0%2%£4K4%£7K6%£11K8%£14K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
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
[1**ZVZK Period Pants Heavy Flow 30ML Absorbent Women Leak Proof Panty Period Knickers Menstrual Underwear 3 Pack (M Pack of 3)**ZVZK**£13.56**4.2★3,582 rev](https://www.amazon.co.uk/dp/B0B4MYJLJ1) [2**OVRUNS Period Bikini Bottoms Low Waisted Leakproof Swimwear Waterproof Menstrual Swim Short for Teens Girls Women Black II XS**OVRUNS**£11.13**4.5★711 rev](https://www.amazon.co.uk/dp/B0BQXKS62Z) [3**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**£6.00**4.3★102 rev](https://www.amazon.co.uk/dp/B0F1B9ZQBS) [4**OVRUNS Period Bikini Bottoms Low Waisted Leakproof Swimwear Waterproof Menstrual Swim Short for Teens Girls Women Black II S**OVRUNS**£11.00**4.5★711 rev](https://www.amazon.co.uk/dp/B0BQXJ1HGR) [5**WUDEUI Period Bikini Sets for Women 2PCS V Neck High Waisted Tummy Control 4Ply Leakproof Ruched Drawstring Swimwear for Ladies**WUDEUI**£15.56**4.2★22 rev](https://www.amazon.co.uk/dp/B0GGQXWD5Z)
**~~View all top sellers →~~**
### **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**£25.04**31 rev5mo ago](https://www.amazon.co.uk/dp/B0GMYDKC21) [**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**£24.73**31 rev5mo ago](https://www.amazon.co.uk/dp/B0GMYJTT6L) [**WUDEUI Period Bikini Sets for Women 2PCS V Neck High Waisted Tummy Control 4Ply Leakproof Ruched Drawstring Swimwear for Ladies**WUDEUI**£15.56**22 rev6mo ago](https://www.amazon.co.uk/dp/B0GGQXWD5Z) [**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**£11.40**26 rev8mo ago](https://www.amazon.co.uk/dp/B0G2G6YQNB) [**WUKA Teen Period Swimwear Bikini Bottom Leak Proof Reusable Period Bikini Brief Light Flow Swim Pants for Girls Size S Black**WUKA**£17.79**26 rev10mo ago](https://www.amazon.co.uk/dp/B0FPDJJ4LC)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**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**£25.04**4.5★**▲ 25%**](https://www.amazon.co.uk/dp/B0GMYDKC21) [**WUDEUI Period Bikini Sets for Women 2PCS V Neck High Waisted Tummy Control 4Ply Leakproof Ruched Drawstring Swimwear for Ladies**WUDEUI**£15.56**4.2★**▲ 21%**](https://www.amazon.co.uk/dp/B0GGQXWD5Z) [**WUKA Teen Period Swimwear Bikini Bottom Leak Proof Reusable Period Bikini Brief Light Flow Swim Pants for Girls Size XS Black**WUKA**£17.73**4.8★**▲ 21%**](https://www.amazon.co.uk/dp/B0FPDLWR4M) [**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**£24.73**4.5★**▲ 20%**](https://www.amazon.co.uk/dp/B0GMYJTT6L) [**WUKA Period Swimwear Bikini Bottom Light Flow Leak Proof Reusable Washable Period Swimwear for Women Bikini Brief Size S Black**WUKA**£17.89**4.5★**▲ 18%**](https://www.amazon.co.uk/dp/B0FP2FNJ7S)
**~~View all trending →~~**
## **What buyers say about period swimwear**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**17%
*“The fit is really flattering”*
**Quality-Overall**16%
*“they work very well”*
**Comfort-Overall**12%
*“Theyre really comfortable”*
**Advertised Vs Actual Product**5%
*“As described”*
**Shape/Style**5%
*“Its a nice stylish costume”*
**Material Quality**5%
*“in the material gives it a comfortable”*
**Exercise/Sports Suitability**3%
*“This is perfect for being able to still go for a swim and beach”*
**Water Resistance**3%
*“Being able to swim freely is a great comfort”*
**Value For Money**3%
*“Great for the price”*
**Soft Feel**3%
*“The fabric feels soft”*
### **What buyers complain about **
**Size-Overall**21%
*“Fit wasnt great”*
**Value For Money**5%
*“somewhat expensive for what it is”*
**Quality-Overall**5%
*“Poor Quality”*
**Comfort-Overall**5%
*“slightly uncomfortable”*
**Water Resistance**4%
*“It not waterproof at all”*
**Absorbency**4%
*“I was a bit unsure about ordering these because you never know with sizing and absorbency claims,”*
**Material Quality**3%
*“Avoid - Very cheap fabric”*
**Durability**2%
*“Did not survive the purpose”*
**Smell**2%
*“instantly hit with a horrid smell”*
**Functionality-Overall**2%
*“Dont work”*
### **Top return reasons **
**Size-Overall**77%
**Length**3%
**Quality-Overall**2%
**Material Quality**2%
**Thin**2%
**Chest Fit**2%
**Shape/Style**2%
**Waist Fit**1%
**Advertised Vs Actual Product**1%
**Transparency**1%
## **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.
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