thinx period underwear
Skip itSoft demand (-11.9% this quarter) — this niche doesn't clear our bar today.
Avg price
Great$19.24avg listing price — sweet spot $15–$100
Price range
Great$11.01–$35.07cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
Good54%top-5 click share — leaders hold, buyers still browse
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Review moat
Okay2,826.04avg incumbent reviews — the moat a new listing must climb
Returns
Okay4.3%return rate — above 5% kills the launch gate
Brand share
Okay86%top-5 brand share — brands hold most of the demand
Market size
Okay$113K$113K/yr · 345K searches
Conversion
Bad1.7%search→purchase rate — share of searches ending in a sale
Growth
Bad-11.9%90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, thinx period underwear is a $113K/yr Amazon United States market (345K searches/yr). The top 5 brands hold 86% of demand. Demand peaks in Jul–Aug–Sep. Verdict: Skip it — 38/100.
Data updated Jul 11, 2026 · scored weekly · How we score niches
thinx period underwear market data
- Units sold / yr
- 8K–10K
- avg 250–500/product
- Revenue / yr
- $154K–$192K
- units × avg price
- Conversion rate
- 1.7%
- Avg BSR
- #57
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 86%
- Out of stock
- 3.1%
- Avg brand age
- 43 months
- Avg seller age
- 157 days
Competition & brand share
The top 5 products take 54% of clicks — established leaders, but buyers still shop beyond them.Brands
10 falling
Sellers
18
Top-5 brand share
86%
Top 20: 100%
Top-5 click share
54%
Top 20: 90%
Open market
9%
- Demifill27%
- Mesachy22%
- Hanes22%
- Nalwort8%
- INNERSY7%
- Geronmine5%
- Open — no brand owns it (4 brands, 9%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -11.9% search growth over the last 90 days.Peak months: Jul, Aug, Sep · busiest ÷ quietest = 3.8×
Top thinx period underwear search terms
- girls period underwear142K/yr
- period underwear for girls71K/yr
- period panties for girls26K/yr
- teen period panties68K/yr
- girls period panties16K/yr
- period underwear teens11K/yr
- teens period underwear7K/yr
- menstrual underwear for teen girls5K/yr
Top thinx period underwear 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.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Demifill Teen Girls Period Panties Juniors First Period Starter Underwear Soft Briefs 12-14Years
Demifill$21.194.4★4,942 rev
Mesachy Teens Girls Period Underwear Kids Period Panties Menstrual Leakproof Protective Underwear for Teens Cotton Briefs
Mesachy$17.764.5★1,468 rev
Hanes Girls Hipster Period Underwear Comfort Period. Panties Moderate Protection 6-Pack
Hanes$20.514.4★1,146 rev
Nalwort Teen Girls Period Underwear Menstrual Period Panties Leak-Proof Cotton Protective Briefs Pack of 6(Multicolor-5 12-14 Years)
Nalwort$23.514.5★9,095 rev
Mesachy Teens Girls Period Underwear Kids Period Panties Menstrual Leakproof Protective Underwear for Teens Cotton Briefs
Mesachy$21.424.5★1,468 rev
Newest
by launch date
Musort Period Underwear for Teens Heavy Flow High Absorbency Girls Menstrual Panties Cotton Leakproof Protective Briefs
Musort$11.01187 rev
TIICHOO Period Panties for Teens Seamless Menstrual Leakproof Underwear for Girls 5-Pack(10-12 Years 2 Black/Beige/Pink/Green)
TIICHOO$35.0769 rev
INNERSY Girls Period Underwear for Teens Heavy Flow Panties Size 10-18 Hold 4 Tampons 3-Pack(L(12-14 yrs) Solid Black)
INNERSY$22.8494 rev
Geronmine Teen Girls Period Panties Heavy Flow High Absorbency First Period Starter Underwear For Teens Menstrual Leakproof Protective Cotton Soft Briefs
Geronmine$13.66529 rev
Geronmine Teen Girls Period Underwear Menstrual Leakproof Panties for First Period Starter Panty Kids Cotton Protective Brief (US Age 14 Years 16 Years Color-A)
Geronmine$15.54633 rev
Trending
90-day click momentum
Demifill Teen Girls Period Panties Juniors First Period Starter Underwear Soft Briefs 8-10Years
Demifill$25.124.4★
Hanes Girls Period Underwear Comfort Period. Hipster Panty Moderate Protection Period Panties 4-Pack
Hanes$12.814.6★
Hanes Girls Hipster Period Underwear Comfort Period. Panties Moderate Protection 6-Pack
Hanes$20.924.4★
Demifill Teen Girls Period Underwear Girls Cotton Briefs Soft Underwear For Teens 14Years Mixed Colour
Demifill$16.284.4★
Hanes Girls Hipster Period Underwear Comfort Period. Panties Moderate Protection 6-Pack
Hanes$19.874.4★
What buyers say about thinx period underwear
What buyers praise and complain about, mined from review topics.What buyers love
“Super comfortable”
“These panties are very well made”
“True to size and description”
“wash well too”
“Nice and thick”
“Worth it”
“Cute colors”
“Value & Softness”
“Durable, easy to store”
“As expected”
What buyers complain about
“Not comfortable”
“NOT ABSORBENT”
“Sizing is tricky”
“Do not work”
“A little thicker than normal underwear”
“False advertising”
“Poor quality material”
“Not worth it”
“cause chafing on my daughter's skin”
“Very stiff material”
Top return reasons
Common questions
- Is thinx period underwear profitable to sell on Amazon United States?
- The niche generates $113K/yr across 28 tracked products. 0 of 2 products launched in the last 360 days are still selling. 90-day search growth is -11.9%. Flapen's verdict: Skip it (38/100).
- How competitive is the thinx period underwear niche?
- 10 brands and 18 sellers compete. The top 5 products take 54% of clicks and top 5 brands hold 86% of demand.
- What do buyers complain about in thinx period underwear?
- Top complaints mined from reviews: Comfort-Overall, Absorbency, Size-Overall. The return rate is 4.3%.
- When does demand for thinx period underwear peak?
- Demand peaks in Jul–Aug–Sep; the busiest month runs 3.8× the quietest.
- What does it cost to enter the thinx period underwear niche?
- Listings span $11.01–$35.07; the average listing price is $19.24 (sweet spot $15–$100). The average incumbent carries 2,826 reviews — the moat a new listing must climb.