---
title: "Thinx Period Underwear for Teen Girls — $98K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/clothing-shoes-jewelry/thinx-period-underwear-for-teen-girls"
last_updated: "2026-08-06T02:59:33.314Z"
locale: en
meta:
description: "Niche score 44/100 · $98K/yr market · 186K searches/yr · $25.72 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 44/100 · $98K/yr market · 186K searches/yr · $25.72 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Thinx Period Underwear for Teen Girls — $98K/yr Amazon US Niche (2026) - Flapen"
---
# **thinx period underwear for teen girls**
**Skip it**
Soft demand (-4.1% this quarter) — this niche doesn't clear our bar today.
Market size 25Growth 23Conversion 26Competition 77Returns 31Price range 88Avg price 95Brand share 31Review moat 48Quality gap 48
**Avg price**
**Incredible****$25.72**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$11.01–$53.89**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Competition**
**Great****38%**
top-5 click share — an open shelf
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Okay****1,740.36**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Okay****86%**
top-5 brand share — brands hold most of the demand
**Returns**
**Okay****4.5%**
return rate — above 5% kills the launch gate
**Conversion**
**Okay****2.1%**
search→purchase rate — share of searches ending in a sale
**Market size**
**Bad****$98K**
$98K/yr · 186K searches
**Growth**
**Bad****-4.1%**
90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, thinx period underwear for teen girls is a $98K/yr Amazon United States market (186K searches/yr). The top 5 brands hold 86% of demand. Demand peaks in Mar–Nov. Verdict: Skip it — 44/100.
Data updated Jul 11, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **thinx period underwear for teen girls market data**
- **Units sold / yr**
- **5K–6K**
- avg 100–250/product
- **Revenue / yr**
- **$129K–$154K**
- units × avg price
- **Conversion rate**
- **2.1%**
- **Avg BSR**
- **#97**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **87%**
- **Out of stock**
- **5.6%**
- **Avg brand age**
- **40 months**
- **Avg seller age**
- **170 days**
## **Competition & brand share**
Clicks spread well past the top 5 (38% combined) — an open shelf where new products get seen.
**Brands**
**13 **▲rising
**Sellers**
**20**
**Top-5 brand share**
**86%**
Top 20: 100%
**Top-5 click share**
**38%**
Top 20: 75%
**Open market**
**10%**
- Hanes26% - Thinx Teens24% - Demifill19% - Mesachy13% - Nalwort4% - INNERSY4% - Open — no brand owns it (7 brands, 10%)
## **Demand & seasonality**
Weekly Amazon search volume, last 66 weeks — -4.1% search growth over the last 90 days.
4K3KPrime Day '25Spike '25Black Friday '25Spike '26 seasonAprMayJunJulAugSepOctNovDecJanFebMarAprMayJun
Peak months: Mar, Nov · busiest ÷ quietest = 2.7×
[**Open Trend **](https://flapen.com/research/us/clothing-shoes-jewelry/thinx-period-underwear-for-teen-girls/trend)
## **Top thinx period underwear for teen girls search terms**
- **thinx teen period underwear**44K/yr-9.6%1.1% conv. - **hanes period underwear for teens**17K/yr+8.1%2.1% conv. - **hanes girls period underwear**8K/yr+67.3%1.6% conv. - **thinx teen**11K/yr-2.5%0.8% conv. - **period underwear for girls 10-12**10K/yr+11.8%1.9% conv. - **girls period underwear size 10-12**12K/yr-21.7%2.5% conv. - **kids period underwear**8K/yr+3.8%1.6% conv. - **period panties for girls 10-12**19K/yr-34.0%1.9% conv. - **period under wear for teens**5K/yr+511.0%2.6% conv. - **thinx period underwear for teen girls**8K/yr+33.9%1.5% conv. [**All search terms **](https://flapen.com/research/us/clothing-shoes-jewelry/thinx-period-underwear-for-teen-girls/search-terms)
## **Top thinx period underwear for teen girls 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%3%$3K6%$6K9%$9K12%$12K1101001K10K 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**Demifill Teen Girls Period Panties Juniors First Period Starter Underwear Soft Briefs 12-14Years**Demifill**$21.19**4.4★4,942 rev](https://www.amazon.com/dp/B09N1F5YV3) [2**Mesachy Teens Girls Period Underwear Kids Period Panties Menstrual Leakproof Protective Underwear for Teens Cotton Briefs**Mesachy**$17.76**4.5★1,468 rev](https://www.amazon.com/dp/B0BWH9TDPM) [3**Hanes Girls Hipster Period Underwear Comfort Period. Panties Moderate Protection 6-Pack**Hanes**$20.51**4.4★1,146 rev](https://www.amazon.com/dp/B0CVS6LBM9) [4**Hanes Girls Period Underwear Comfort Period. Hipster Panty Moderate Protection Period Panties 4-Pack**Hanes**$13.43**4.6★2,786 rev](https://www.amazon.com/dp/B0B9P19TM3) [5**Thinx Teens Period Underwear Brief-Style Period Panties for Teens Holds Up to Regular 12 Tampons* Period Panties Reusable 3-Pack - (2) Black + (1) Hot Pink Size 15/16**Thinx Teens**$52.76**4.6★519 rev](https://www.amazon.com/dp/B0D382PKRT)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Thinx Teens Period Underwear Bikini-Style Period Panties for Teens Holds Up to 12 Regular Tampons Leakproof Reusble and Controls Odor Desert Camo X-Large**Thinx Teens**$18.06**2 rev4mo ago](https://www.amazon.com/dp/B0GK38HF4F) [**Thinx Teens Period Underwear Overnight Boyshort Period Panties for Teens Holds Up to 12 Regular Tampons Leakproof Reusble and Controls Odor Black Large**Thinx Teens**$28.45**1 rev4mo ago](https://www.amazon.com/dp/B0GK2MKVWF) [**Thinx Teens Period Underwear Bikini-Style Period Panties for Teens Holds Up to 12 Regular Tampons Leakproof Reusble and Controls Odor Desert Camo Medium**Thinx Teens**$17.82**2 rev4mo ago](https://www.amazon.com/dp/B0GK2LHT6T) [**Hanes Girls Period Underwear Boxer Briefs Comfort Period Boxer Brief Panties for Girls Moderate Protection**Hanes**$24.76**1,146 rev9mo ago](https://www.amazon.com/dp/B0FRGMKJ2C) [**Hanes Girls Period Underwear Boxer Briefs Comfort Period Boxer Brief Panties for Girls Moderate Protection**Hanes**$24.25**1,146 rev9mo ago](https://www.amazon.com/dp/B0FRGFV2Q9)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Thinx Teens Period Underwear Bikini-Style Period Panties for Teens Holds Up to 12 Regular Tampons Leakproof Reusble and Controls Odor Desert Camo X-Large**Thinx Teens**$18.06**5.0★**▲ 86%**](https://www.amazon.com/dp/B0GK38HF4F) [**Thinx Teens Period Underwear Bikini-Style Period Panties for Teens Holds Up to 12 Regular Tampons Leakproof Reusble and Controls Odor Desert Camo Medium**Thinx Teens**$17.82**5.0★**▲ 86%**](https://www.amazon.com/dp/B0GK2LHT6T) [**Thinx Teens Period Underwear Overnight Boyshort Period Panties for Teens Holds Up to 12 Regular Tampons Leakproof Reusble and Controls Odor Black Large**Thinx Teens**$28.45**4.0★**▲ 85%**](https://www.amazon.com/dp/B0GK2MKVWF) [**Hanes Girls Period Underwear Boxer Briefs Comfort Period Boxer Brief Panties for Girls Moderate Protection**Hanes**$24.25**4.4★**▲ 79%**](https://www.amazon.com/dp/B0FRGFV2Q9) [**Hanes Girls Period Underwear Boxer Briefs Comfort Period Boxer Brief Panties for Girls Moderate Protection**Hanes**$24.76**4.4★**▲ 70%**](https://www.amazon.com/dp/B0FRGMKJ2C)
**~~View all trending →~~**
## **What buyers say about thinx period underwear for teen girls**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Comfort-Overall**25%
*“Super comfortable”*
**Quality-Overall**17%
*“These panties are very well made”*
**Size-Overall**16%
*“True to size and description”*
**Washability**5%
*“wash well too”*
**Value For Money**4%
*“Worth it”*
**Thickness**4%
*“Nice and thick”*
**Soft Feel**3%
*“Value & Softness”*
**Color**2%
*“Cute colors”*
**Material Quality**2%
*“I love the material”*
**Design-Overall**2%
*“the design is cute”*
### **What buyers complain about **
**Size-Overall**14%
*“Sizing is tricky”*
**Comfort-Overall**14%
*“Not comfortable”*
**Absorbency**10%
*“NOT ABSORBENT”*
**Functionality-Overall**8%
*“Do not work”*
**Advertised Vs Actual Product**7%
*“False advertising”*
**Thickness**6%
*“A little thicker than normal underwear”*
**Value For Money**3%
*“I expected more for the price”*
**Material Quality**3%
*“Poor quality material”*
**Allergies**3%
*“cause chafing on my daughter's skin”*
**Quality-Overall**3%
*“Cheaply made”*
### **Top return reasons **
**Size-Overall**69%
**Waist Fit**6%
**Material Quality**4%
**Advertised Vs Actual Product**3%
**Thigh Fit**2%
**Thin**2%
**Comfort-Overall**1%
**Length**1%
**Absorbency**1%
**Thickness**1%
## **Common questions**
- **Is thinx period underwear for teen girls profitable to sell on Amazon United States?**
- The niche generates $98K/yr across 47 tracked products. 2 of 7 products launched in the last 360 days are still selling. 90-day search growth is -4.1%. Flapen's verdict: Skip it (44/100).
- **How competitive is the thinx period underwear for teen girls niche?**
- 13 brands and 20 sellers compete. The top 5 products take 38% of clicks and top 5 brands hold 86% of demand.
- **What do buyers complain about in thinx period underwear for teen girls?**
- Top complaints mined from reviews: Size-Overall, Comfort-Overall, Absorbency. The return rate is 4.5%.
- **When does demand for thinx period underwear for teen girls peak?**
- Demand peaks in Mar–Nov; the busiest month runs 2.7× the quietest.
- **What does it cost to enter the thinx period underwear for teen girls niche?**
- Listings span $11.01–$53.89; the average listing price is $25.72 (sweet spot $15–$100). The average incumbent carries 1,740 reviews — the moat a new listing must climb.
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