california king duvet insert
Skip itA deep review moat (40,788 avg reviews) — this niche doesn't clear our bar today.
Avg price
Great$73.95avg listing price — sweet spot $15–$100
Market size
Good$833K$833K/yr · 386K searches
Returns
Good2.5%return rate — above 5% kills the launch gate
Price range
Good$26.41–$156.82cheapest to priciest tracked listing — scored on the share inside $15–$100
Brand share
Okay77%top-5 brand share — brands hold most of the demand
Competition
Okay59%top-5 click share — leaders hold, buyers still browse
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Conversion
Okay2.9%search→purchase rate — share of searches ending in a sale
Growth
Bad-20.0%90-day search growth — must beat 0% to launch
Review moat
Bad40,788.42avg incumbent reviews — the moat a new listing must climb
According to Flapen's Amazon United States niche tracking, california king duvet insert is a $833K/yr Amazon United States market (386K searches/yr). The top 5 brands hold 77% of demand. Demand peaks in Nov–Dec. Verdict: Skip it — 46/100.
Data updated Jul 18, 2026 · scored weekly · How we score niches
california king duvet insert market data
- Units sold / yr
- 10K–13K
- avg 250–500/product
- Revenue / yr
- $740K–$924K
- units × avg price
- Conversion rate
- 2.9%
- Avg BSR
- #30
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 96%
- Out of stock
- 7.4%
- Avg brand age
- 52 months
- Avg seller age
- 187 days
Competition & brand share
The top 5 products take 59% of clicks — established leaders, but buyers still shop beyond them.Brands
15 flat
Sellers
24
Top-5 brand share
77%
Top 20: 100%
Top-5 click share
59%
Top 20: 96%
Open market
19%
- Utopia Bedding31%
- Bedsure24%
- DOWNCOOL10%
- EGYPTIAN BEDDING8%
- EASELAND5%
- COHOME3%
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -20.0% search growth over the last 90 days.Peak months: Nov, Dec · busiest ÷ quietest = 1.8×
Top california king duvet insert search terms
- california king duvet insert86K/yr
- california king duvet51K/yr
- california king down comforter40K/yr
- duvet insert california king37K/yr
- down comforter california king size38K/yr
- cal king duvet insert25K/yr
- cal king duvet19K/yr
- duvet california king19K/yr
- cali king duvet insert11K/yr
- cal king down comforter14K/yr
Top california 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
Utopia Bedding Comforters California King Size All Season Duvet Insert Down Alternative Box Stitched Bed Comforter with Corner Tabs Machine Washable (White)
Utopia Bedding$35.624.6★126,601 rev
Bedsure Comforter Duvet Insert - Quilted Comforters Cal King Size All Season Duvet GentleSoft Down Alternative Bedding Blanket with 8 Tabs Gifts for Women/Men White California King 96X102 Inches
Bedsure$70.724.7★76,669 rev
Utopia Bedding California King Comforter Duvet Insert Quilted White Comforter with Corner Tabs Box Stitched Down Alternative Comforters California King Size 96 x 102 inches
Utopia Bedding$44.454.6★155,570 rev
DOWNCOOL Feather Comforter California King Size 100% Cotton Cover Ultra Soft Fluffy Duvet Insert All Season Luxurious Hotel Bed Comforter with Corner Tabs White 104x96
DOWNCOOL$70.264.3★3,215 rev
EASELAND California King Down Alternative Comforter - Quilted Duvet Insert for All Seasons Soft Lightweight with Corner Tabs Summer Winter Warm Bedding White 96x104 Inches
EASELAND$56.204.6★41,382 rev
Newest
by launch date
L LOVSOUL Organic 75% Down Fiber Comforter Cali King Size 850+FP 1200TC Extra Fluffy Hotel Style Luxury Ultra Soft All Season White Duvet Insert with 8 Corner Tabs
L LOVSOUL$133.67135 rev
Oaken-Cat Goose Feather Down Fiber Comforter California King - 100% Organic Cotton Shell All Season Duvet Insert Medium Warmth Hotel Luxury Bedding Comforter(104x96 Inch White)
Oaken-Cat$103.961,668 rev
Cosybay Feather and Down Fiber Comforter Insert California King Size 100% Cotton Cover All Season White Duvet Insert Fluffy Soft Hotel Luxury Bedding for Bedroom Cal King 104 x 96 Inch
Cosybay$78.934,469 rev
L LOVSOUL Goose Feather Down Fiber Comforter California King Size 100% Organic Cotton Fabric Duvet Insert 1200TC 750+Fill Power Hotel Collection All Season White Bedding Comforters with 8 Tabs
L LOVSOUL$105.932,790 rev
DOWNCOOL Feather Comforter California King Size 100% Cotton Cover Ultra Soft Fluffy Duvet Insert All Season Luxurious Hotel Bed Comforter with Corner Tabs White 104x96
DOWNCOOL$70.263,215 rev
Trending
90-day click momentumL LOVSOUL Organic 75% Down Fiber Comforter Cali King Size 850+FP 1200TC Extra Fluffy Hotel Style Luxury Ultra Soft All Season White Duvet Insert with 8 Corner Tabs
L LOVSOUL$133.674.6★
Utopia Bedding California King Comforter Duvet Insert Quilted White Comforter with Corner Tabs Box Stitched Down Alternative Comforters California King Size 96 x 102 inches
Utopia Bedding$44.454.6★
Cosybay Feather and Down Fiber Comforter Insert California King Size 100% Cotton Cover All Season White Duvet Insert Fluffy Soft Hotel Luxury Bedding for Bedroom Cal King 104 x 96 Inch
Cosybay$78.934.5★
Oaken-Cat Goose Feather Down Fiber Comforter California King - 100% Organic Cotton Shell All Season Duvet Insert Medium Warmth Hotel Luxury Bedding Comforter(104x96 Inch White)
Oaken-Cat$103.964.6★
Amazon Basics White Down Alternative Comforter and Duvet Insert with Corner Tabs Machine Washable King Light White
Amazon Basics$26.504.7★
What buyers say about california king duvet insert
What buyers praise and complain about, mined from review topics.What buyers love
“Love the comfort”
“Keeps you warm”
“Great quality, its a cool white color”
“soft to the touch”
“Amazing price”
“This comforter is warm and lightweight”
“It's very cozy, soft, and fluffy”
“Fits great”
“As advertised”
“THE COLOR IS GREAT”
What buyers complain about
“Was bigger”
“Quality is poor and thin”
“not thick enough for me”
“its falling apart”
“didnt fluff up”
“making it uncomfortable to sleep with through the night”
“smelling like actual crap”
“Lumpy once washed”
“scratchy material”
“Cheap”
Top return reasons
Common questions
- Is california king duvet insert profitable to sell on Amazon United States?
- The niche generates $833K/yr across 24 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is -20.0%. Flapen's verdict: Skip it (46/100).
- How competitive is the california king duvet insert niche?
- 15 brands and 24 sellers compete. The top 5 products take 59% of clicks and top 5 brands hold 77% of demand.
- What do buyers complain about in california king duvet insert?
- Top complaints mined from reviews: Size-Overall, Quality-Overall, Thickness. The return rate is 2.5%.
- When does demand for california king duvet insert peak?
- Demand peaks in Nov–Dec; the busiest month runs 1.8× the quietest.
- What does it cost to enter the california king duvet insert niche?
- Listings span $26.41–$156.82; the average listing price is $73.95 (sweet spot $15–$100). The average incumbent carries 40,788 reviews — the moat a new listing must climb.