oversized king duvet insert
Skip itA deep review moat (24,828 avg reviews) — this niche doesn't clear our bar today.
Avg price
Great$83.39avg listing price — sweet spot $15–$100
Market size
Great$877K$877K/yr · 403K searches
Brand share
Good70%top-5 brand share — brands hold most of the demand
Competition
Good51%top-5 click share — leaders hold, buyers still browse
Returns
Good2.8%return rate — above 5% kills the launch gate
Price range
Okay$26.41–$176.09cheapest to priciest tracked listing — scored on the share inside $15–$100
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Conversion
Okay2.6%search→purchase rate — share of searches ending in a sale
Growth
Bad-18.6%90-day search growth — must beat 0% to launch
Review moat
Bad24,828.11avg incumbent reviews — the moat a new listing must climb
According to Flapen's Amazon United States niche tracking, oversized king duvet insert is a $877K/yr Amazon United States market (403K searches/yr). The top 5 brands hold 70% of demand. Demand peaks in Jan–Jul–Dec. Verdict: Skip it — 49/100.
Data updated Jul 18, 2026 · scored weekly · How we score niches
oversized king duvet insert market data
- Units sold / yr
- 8K–10K
- avg 250–500/product
- Revenue / yr
- $667K–$834K
- units × avg price
- Conversion rate
- 2.6%
- Avg BSR
- #34
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 96%
- Out of stock
- 13.2%
- Avg brand age
- 55 months
- Avg seller age
- 184 days
Competition & brand share
The top 5 products take 51% of clicks — established leaders, but buyers still shop beyond them.Brands
16 falling
Sellers
23
Top-5 brand share
70%
Top 20: 100%
Top-5 click share
51%
Top 20: 90%
Open market
24%
- Bedsure33%
- DOWNCOOL16%
- Serta8%
- L LOVSOUL7%
- STWIENER6%
- Utopia Bedding6%
Demand & seasonality
Weekly Amazon search volume, last 103 weeks — -18.6% search growth over the last 90 days.Peak months: Jan, Jul, Dec · busiest ÷ quietest = 2.9×
Top oversized king duvet insert search terms
- oversized king duvet insert149K/yr
- oversized king duvet48K/yr
- super king duvet insert27K/yr
- oversized king down comforter32K/yr
- duvet insert oversized king23K/yr
- 120x98 duvet insert19K/yr
- oversize king duvet insert14K/yr
- 120x120 duvet insert13K/yr
- super king duvet9K/yr
- oversized duvet insert10K/yr
Top oversized king duvet insert 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
Bedsure Comforter Duvet Insert - Quilted Comforters Oversized King Size All Season Duvet GentleSoft Down Alternative Bedding with 8 Tabs Gifts for Women/Men White Oversized King 116 x 98 Inches
Bedsure$75.644.7★76,669 rev
DOWNCOOL Comforters Oversize King Size White Duvet Insert Lightweight
DOWNCOOL$37.504.6★19,224 rev
Serta Goose Feathers Down Fiber Comforter Oversize King Duvet Insert 100% Cotton Hotel Luxury Hypoallergenic Comforter All Season Medium Warmth 108 x 98 in White
Serta$84.854.6★464 rev
Oversized King Comforter 120x98 Extra Large Super King Spring Lightweight Soft Quilted Down-Alternative Duvet Insert Fluffy Breathable Microfiber with 8 Corner Tabs All Season Bedding White
STWIENER$51.294.6★1,982 rev
EASELAND Oversized King Down Alternative Comforter - Quilted Duvet Insert for All Seasons Soft Lightweight with Corner Tabs Summer Winter Warm Bedding White 98x116 Inches
EASELAND$63.184.6★41,382 rev
Newest
by launch date
CozyLux Oversized King Comforter Duvet Insert White All Season Quilted Bed Comforter Box Stitched Down Alternative Duvet with 8 Corner Tabs Gifts for Women Men 116 x 98 Inches (White)
CozyLux$46.4465 rev
Cosybay Oversized King Size Feather Down Fiber Comforter - Ultra Soft 100% Cotton Duvet Insert All Season Hotel Luxury Bedding with Corner Tabs 116x98 White
Cosybay$78.504,469 rev
L LOVSOUL Goose Feather Down Fiber Comforter King Size 100% Organic Cotton Fabric Duvet Insert 1200TC 750+FP Hotel Collection All Season White Bedding Comforters with 8 Tabs
L LOVSOUL$95.702,790 rev
Serta Goose Feathers Down Fiber Comforter Oversize King Duvet Insert 100% Cotton Hotel Luxury Hypoallergenic Comforter All Season Medium Warmth 108 x 98 in White
Serta$84.85464 rev
Pacific Coast Goose Feather Down Fiber Comforters King Size Extra Fluffy White Duvet Insert Ultra-Soft Breathable All Season Hotel Luxury Bedding Comforters 8 Corner & Center Loops (106x90)
Pacific Coast$169.45932 rev
Trending
90-day click momentumCozyLux Oversized King Comforter Duvet Insert White All Season Quilted Bed Comforter Box Stitched Down Alternative Duvet with 8 Corner Tabs Gifts for Women Men 116 x 98 Inches (White)
CozyLux$46.444.8★
Hotel Luxury All Season Feather Down Comforter Oversized King Silky Soft Egyptian Cotton Blend Cover Fluffy Ethically Sourced Feather & Down Fibers Filled Duvet Insert with Ties 120x98 Inch White
Cobnom$110.643.0★
Cosybay Oversized King Size Feather Down Fiber Comforter - Ultra Soft 100% Cotton Duvet Insert All Season Hotel Luxury Bedding with Corner Tabs 116x98 White
Cosybay$78.504.5★
DOWNCOOL Feather Comforter Oversized King Size 100% Cotton Cover Ultra Soft Fluffy Duvet Insert All Season Luxurious Hotel Bedding Comforters with Corner Tabs White 116x98
DOWNCOOL$78.704.3★
EASELAND Oversized King Down Alternative Comforter - Quilted Duvet Insert for All Seasons Soft Lightweight with Corner Tabs Summer Winter Warm Bedding White 98x116 Inches
EASELAND$63.184.6★
What buyers say about oversized king duvet insert
What buyers praise and complain about, mined from review topics.What buyers love
“Love the comfort”
“Is a really good quality and fluffy”
“Comfortable and warm”
“Soft and fluffy”
“Amazing price”
“This comforter is warm and lightweight”
“Fits Perfect”
“Nice and fluffy”
“As advertised”
“THE COLOR IS GREAT”
What buyers complain about
“Not thick as advertised”
“Mid to low quality”
“Too small”
“Flat not fluffy”
“Does not last”
“making it uncomfortable to sleep with through the night”
“Cheap”
“it smells like rotten fish”
“Not great quality material”
“Hole in it after washing”
Top return reasons
Common questions
- Is oversized king duvet insert profitable to sell on Amazon United States?
- The niche generates $877K/yr across 28 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is -18.6%. Flapen's verdict: Skip it (49/100).
- How competitive is the oversized king duvet insert niche?
- 16 brands and 23 sellers compete. The top 5 products take 51% of clicks and top 5 brands hold 70% of demand.
- What do buyers complain about in oversized king duvet insert?
- Top complaints mined from reviews: Thickness, Quality-Overall, Size-Overall. The return rate is 2.8%.
- When does demand for oversized king duvet insert peak?
- Demand peaks in Jan–Jul–Dec; the busiest month runs 2.9× the quietest.
- What does it cost to enter the oversized king duvet insert niche?
- Listings span $26.41–$176.09; the average listing price is $83.39 (sweet spot $15–$100). The average incumbent carries 24,828 reviews — the moat a new listing must climb.