---
title: "Duvet Filler King — $112K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/home-kitchen/duvet-filler-king"
last_updated: "2026-08-06T22:55:44.588Z"
locale: en
meta:
description: "Niche score 47/100 · $112K/yr market · 35K searches/yr · $57.61 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 47/100 · $112K/yr market · 35K searches/yr · $57.61 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Duvet Filler King — $112K/yr Amazon US Niche (2026) - Flapen"
---
# **duvet filler king**
**Skip it**
A deep review moat (31,216 avg reviews) — this niche doesn't clear our bar today.
Market size 27Growth 26Conversion 63Competition 55Returns 60Price range 79Avg price 90Brand share 48Review moat 10Quality gap 50
**Avg price**
**Great****$57.61**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$26.52–$118.65**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Conversion**
**Good****5.6%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Good****2.6%**
return rate — above 5% kills the launch gate
**Competition**
**Good****52%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Good****4.5★**
avg incumbent rating — lower means beatable quality
**Brand share**
**Okay****76%**
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**
**Bad****31,216.36**
avg incumbent reviews — the moat a new listing must climb
**Signals**[** High Price**](https://flapen.com/research/niches?market=us&signal=high_price "Avg price > $50")
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 ~~](https://flapen.com/research/methodology)
## **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.
1K600Spike '24Holiday '24Spike '25Prime Day '25Black Friday '25Spike '26 seasonDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.4×
[**Open Trend **](https://flapen.com/research/us/home-kitchen/duvet-filler-king/trend)
## **Top duvet filler king search terms**
- **cotton duvet insert king**10K/yr+9.6%1.6% conv. - **king insert for duvet cover**9K/yr+7.1%5.6% conv. - **duvet cover insert king**5K/yr+0.6%4.0% conv. - **king comforter insert for duvet cover**4K/yr-7.7%6.0% conv. - **duvet filler king**5K/yr-15.0%4.9% conv. - **hypoallergenic duvet insert king**1K/yr-13.4%2.6% conv. [**All search terms **](https://flapen.com/research/us/home-kitchen/duvet-filler-king/search-terms)
## **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.
0%5%$6K10%$11K15%$17K20%$22K101001K10K100K1.0M 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**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**$36.55**4.6★155,712 rev](https://www.amazon.com/dp/B01DE29JW0) [2**Utopia Bedding White Comforter King Size Duvet Insert Down Alternative Comforter**Utopia Bedding**$30.62**4.6★126,713 rev](https://www.amazon.com/dp/B01JPECPZE) [3**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**$48.06**4.7★76,760 rev](https://www.amazon.com/dp/B07YKLXB3Y) [4**Amazon Basics White Down Alternative Comforter and Duvet Insert with Corner Tabs Machine Washable King Light White**Amazon Basics**$26.60**4.6★5,815 rev](https://www.amazon.com/dp/B071NTZ7TW) [5**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**$50.51**4.5★700 rev](https://www.amazon.com/dp/B09PYR7W7G)
**~~View all top sellers →~~**
### **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**$68.28**542 rev3mo ago](https://www.amazon.com/dp/B0GT5BPJCP) [**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**$79.33**61 rev5mo ago](https://www.amazon.com/dp/B0GK8MQZ9Z) [**ACCURATEX King Duvet Insert Comforter Cotton Shell 400GSM Fill 104x90**ACCURATEX**$64.03**235 rev9mo ago](https://www.amazon.com/dp/B0FS6NNHVZ) [**Feather Down Comforter King Size 100% Cotton Duvet Insert**Vexino**$53.72**595 rev11mo ago](https://www.amazon.com/dp/B0GJRT7CY9) [**Cobnom Feather and Down Fibres Comforter King Size - 100% Organic Cotton Quill-Free & Ethical Luxury All Season Duvet Insert (White 106x90 Inches)**Cobnom**$86.93**346 rev1y ago](https://www.amazon.com/dp/B0F8Q5NWK7)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Feather Down Comforter King Size 100% Cotton Duvet Insert**Vexino**$53.72**4.5★**▲ 260%**](https://www.amazon.com/dp/B0GJRT7CY9) [**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**$68.28**4.3★**▲ 252%**](https://www.amazon.com/dp/B0GT5BPJCP) [**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**$79.33**4.6★**▲ 241%**](https://www.amazon.com/dp/B0GK8MQZ9Z) [**ACCURATEX Lightweight Duvet Insert King Cotton Shell 250GSM Fill 104x90**ACCURATEX**$60.18**4.4★**▲ 200%**](https://www.amazon.com/dp/B0DXP64RFH) [**Cobnom Feather and Down Fibres Comforter King Size - 100% Organic Cotton Quill-Free & Ethical Luxury All Season Duvet Insert (White 106x90 Inches)**Cobnom**$86.93**4.4★**▲ 126%**](https://www.amazon.com/dp/B0F8Q5NWK7)
**~~View all trending →~~**
## **What buyers say about duvet filler king**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Comfort-Overall**17%
*“Love the comfort”*
**Warmth**13%
*“provides good warmth”*
**Soft Feel**11%
*“Soft and fluffy”*
**Quality-Overall**10%
*“Good affordable price for the quality”*
**Value For Money**7%
*“Amazing price”*
**Weight Light**6%
*“This comforter is warm and lightweight”*
**Size-Overall**5%
*“Fits great”*
**Fluffiness**4%
*“It's very cozy, soft, and fluffy”*
**Advertised Vs Actual Product**2%
*“As advertised”*
**Color**2%
*“THE COLOR IS GREAT”*
### **What buyers complain about **
**Size-Overall**10%
*“which is huge”*
**Quality-Overall**8%
*“Mid to low quality”*
**Thickness**7%
*“be very thick however”*
**Fluffiness**5%
*“Not fluffy”*
**Comfort-Overall**3%
*“making it uncomfortable to sleep with through the night”*
**Smell**3%
*“this smell is rancid”*
**Value For Money**3%
*“I now know why this product is priced lower”*
**Material Quality**3%
*“scratchy material”*
**Heating**2%
*“Too Hot”*
**Washability**2%
*“Lumpy once washed”*
### **Top return reasons **
**Size-Overall**33%
**Material Quality**8%
**Thin**7%
**Comfort-Overall**7%
**Warmth**6%
**Advertised Vs Actual Product**6%
**Value For Money**4%
**Weight Heavy**4%
**Color**4%
**Quality-Overall**3%
## **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.
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