duvet filler king
Skip itA deep review moat (31,216 avg reviews) — this niche doesn't clear our bar today.
Avg price
Great$57.61avg listing price — sweet spot $15–$100
Price range
Great$26.52–$118.65cheapest to priciest tracked listing — scored on the share inside $15–$100
Conversion
Good5.6%search→purchase rate — share of searches ending in a sale
Returns
Good2.6%return rate — above 5% kills the launch gate
Competition
Good52%top-5 click share — leaders hold, buyers still browse
Quality gap
Good4.5★avg incumbent rating — lower means beatable quality
Brand share
Okay76%top-5 brand share — brands hold most of the demand
Market size
Okay$112K$112K/yr · 35K searches
Growth
Okay+1.0%90-day search growth — must beat 0% to launch
Review moat
Bad31,216.36avg incumbent reviews — the moat a new listing must climb
According to Flapen's Amazon United States niche tracking, duvet filler king is a $112K/yr Amazon United States market (35K searches/yr). The top 5 brands hold 76% of demand. Verdict: Skip it — 47/100.
Data updated Jul 18, 2026 · scored weekly · How we score niches
duvet filler king market data
- Units sold / yr
- 2K–2K
- avg 0–100/product
- Revenue / yr
- $86K–$115K
- units × avg price
- Conversion rate
- 5.6%
- Avg BSR
- #49
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 96%
- Out of stock
- 1.1%
- Avg brand age
- 44 months
- Avg seller age
- 188 days
Competition & brand share
The top 5 products take 52% of clicks — established leaders, but buyers still shop beyond them.Brands
15 rising
Sellers
22
Top-5 brand share
76%
Top 20: 100%
Top-5 click share
52%
Top 20: 95%
Open market
19%
- Utopia Bedding33%
- Bedsure21%
- Amazon Basics11%
- Martha Stewart6%
- HOMTEC6%
- ACCURATEX5%
Demand & seasonality
Weekly Amazon search volume, last 97 weeks — +1.0% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.4×
Top duvet filler king search terms
- cotton duvet insert king10K/yr
- king insert for duvet cover9K/yr
- duvet cover insert king5K/yr
- king comforter insert for duvet cover4K/yr
- duvet filler king5K/yr
- hypoallergenic duvet insert king1K/yr
Top duvet filler king 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
Utopia Bedding King Comforter Duvet Insert Quilted White Comforter with Corner Tabs Box Stitched Down Alternative Comforters King Size 90 x 102 inches
Utopia Bedding$36.554.6★155,712 rev
Utopia Bedding White Comforter King Size Duvet Insert Down Alternative Comforter
Utopia Bedding$30.624.6★126,713 rev
Bedsure Comforter Duvet Insert - Quilted Comforters King Size All Season Duvet GentleSoft Down Alternative Bedding Blanket with 8 Tabs Gifts for Women/Men White King 90 x 102 Inches
Bedsure$48.064.7★76,760 rev
Amazon Basics White Down Alternative Comforter and Duvet Insert with Corner Tabs Machine Washable King Light White
Amazon Basics$26.604.6★5,815 rev
HOMTEC Duvet Insert Cotton Comforter King Size White Down Alternative Fill Duvet Insert 100% Cotton Shell Quilted Fluffy Comforter Lightweight All Season 8 Corner Tabs Durable Breathable Noiseless
HOMTEC$50.514.5★700 rev
Newest
by launch date
Ubauba King Size Down Duvet Insert - All Season Cool Touch for Hot Sleepers Premium 100% Cotton Shell Hotel Quality White 106 x 90 Inch
Ubauba$68.28542 rev
Martha Stewart Luxury White Goose Feathers Down Fiber Duvet Insert King Size - Hotel Collection 100% Cotton Cover Comforter All Season Medium Warmth Breathable Hypoallergenic 106 x 90 Inch
Martha Stewart$79.3361 rev
ACCURATEX King Duvet Insert Comforter Cotton Shell 400GSM Fill 104x90
ACCURATEX$64.03235 rev
Feather Down Comforter King Size 100% Cotton Duvet Insert
Vexino$53.72595 rev
Cobnom Feather and Down Fibres Comforter King Size - 100% Organic Cotton Quill-Free & Ethical Luxury All Season Duvet Insert (White 106x90 Inches)
Cobnom$86.93346 rev
Trending
90-day click momentumFeather Down Comforter King Size 100% Cotton Duvet Insert
Vexino$53.724.5★
Ubauba King Size Down Duvet Insert - All Season Cool Touch for Hot Sleepers Premium 100% Cotton Shell Hotel Quality White 106 x 90 Inch
Ubauba$68.284.3★
Martha Stewart Luxury White Goose Feathers Down Fiber Duvet Insert King Size - Hotel Collection 100% Cotton Cover Comforter All Season Medium Warmth Breathable Hypoallergenic 106 x 90 Inch
Martha Stewart$79.334.6★
ACCURATEX Lightweight Duvet Insert King Cotton Shell 250GSM Fill 104x90
ACCURATEX$60.184.4★
Cobnom Feather and Down Fibres Comforter King Size - 100% Organic Cotton Quill-Free & Ethical Luxury All Season Duvet Insert (White 106x90 Inches)
Cobnom$86.934.4★
What buyers say about duvet filler king
What buyers praise and complain about, mined from review topics.What buyers love
“Love the comfort”
“provides good warmth”
“Soft and fluffy”
“Good affordable price for the quality”
“Amazing price”
“This comforter is warm and lightweight”
“Fits great”
“It's very cozy, soft, and fluffy”
“As advertised”
“THE COLOR IS GREAT”
What buyers complain about
“which is huge”
“Mid to low quality”
“be very thick however”
“Not fluffy”
“making it uncomfortable to sleep with through the night”
“this smell is rancid”
“I now know why this product is priced lower”
“scratchy material”
“Too Hot”
“Lumpy once washed”
Top return reasons
Common questions
- Is duvet filler king profitable to sell on Amazon United States?
- The niche generates $112K/yr across 25 tracked products. 5 of 5 products launched in the last 360 days are still selling. 90-day search growth is +1.0%. Flapen's verdict: Skip it (47/100).
- How competitive is the duvet filler king niche?
- 15 brands and 22 sellers compete. The top 5 products take 52% of clicks and top 5 brands hold 76% of demand.
- What do buyers complain about in duvet filler king?
- Top complaints mined from reviews: Size-Overall, Quality-Overall, Thickness. The return rate is 2.6%.
- When does demand for duvet filler king peak?
- Demand is steady year-round — the busiest month runs 1.4× the quietest.
- What does it cost to enter the duvet filler king niche?
- Listings span $26.52–$118.65; the average listing price is $57.61 (sweet spot $15–$100). The average incumbent carries 31,216 reviews — the moat a new listing must climb.