---
title: "Under Knee Pillow for Sleeping on Back — $772K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/under-knee-pillow-for-sleeping-on-back"
last_updated: "2026-08-09T19:14:31.298Z"
locale: en
meta:
description: "Niche score 55/100 · $772K/yr market · 550K searches/yr · $26.25 avg price. Soft demand (-9.7% this quarter) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 55/100 · $772K/yr market · 550K searches/yr · $26.25 avg price. Soft demand (-9.7% this quarter) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Under Knee Pillow for Sleeping on Back — $772K/yr Amazon US Niche (2026) - Flapen"
---
# **under knee pillow for sleeping on back**
**Worth a look**
Shows a sweet-spot price point ($26.25 avg), but soft demand (-9.7% this quarter) keeps it on the watch list.
Market size 72Growth 20Conversion 61Competition 49Returns 45Price range 84Avg price 95Brand share 71Review moat 25Quality gap 63
**Avg price**
**Incredible****$26.25**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$11.29–$37.30**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Market size**
**Good****$772K**
$772K/yr · 550K searches
**Brand share**
**Good****62%**
top-5 brand share — brands hold most of the demand
**Quality gap**
**Good****4.4★**
avg incumbent rating — lower means beatable quality
**Conversion**
**Good****5.3%**
search→purchase rate — share of searches ending in a sale
**Competition**
**Okay****56%**
top-5 click share — leaders hold, buyers still browse
**Returns**
**Okay****3.4%**
return rate — above 5% kills the launch gate
**Review moat**
**Bad****4,038.68**
avg incumbent reviews — the moat a new listing must climb
**Growth**
**Bad****-9.7%**
90-day search growth — must beat 0% to launch
**Signals**[** No Dominant Brand**](https://flapen.com/research/niches?market=us&signal=no_dominant_brand "Top brand's click share < 20%")
According to Flapen's Amazon United States niche tracking, under knee pillow for sleeping on back is a $772K/yr Amazon United States market (550K searches/yr). The top 5 brands hold 62% of demand. Verdict: Worth a look — 55/100.
Data updated Jul 14, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **under knee pillow for sleeping on back market data**
- **Units sold / yr**
- **25K–30K**
- avg 750–1,000/product
- **Revenue / yr**
- **$656K–$788K**
- units × avg price
- **Conversion rate**
- **5.3%**
- **Avg BSR**
- **#171**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **100%**
- **Out of stock**
- **3.3%**
- **Avg brand age**
- **43 months**
- **Avg seller age**
- **177 days**
## **Competition & brand share**
The top 5 products take 56% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**22 **▲rising
**Sellers**
**27**
**Top-5 brand share**
**62%**
Top 20: 98%
**Top-5 click share**
**56%**
Top 20: 95%
**Open market**
**31%**
- 5 STARS UNITED19% - Everlasting Comfort17% - AllSett Health10% - TranquilRelax10% - MEGCXIT8% - Bedluxe6%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -9.7% search growth over the last 90 days.
10K6KSpike '24Prime Day '25Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.4×
[**Open Trend **](https://flapen.com/research/us/health-household/under-knee-pillow-for-sleeping-on-back/trend)
## **Top under knee pillow for sleeping on back search terms**
- **knee pillow for back sleeping**124K/yr-12.0%5.1% conv. - **bolster pillow for legs**97K/yr-19.8%3.2% conv. - **under knee pillow for sleeping on back**49K/yr-10.9%6.2% conv. - **under knee pillow**41K/yr-12.2%4.2% conv. - **half moon pillow**30K/yr+0.3%2.0% conv. - **knee bolster**22K/yr+12.8%3.3% conv. - **leg bolster**22K/yr-4.5%2.2% conv. - **leg pillow for back sleeping**25K/yr-19.1%4.5% conv. - **knee bolster for sleeping**19K/yr-17.7%6.3% conv. - **knee pillow for back sleepers**18K/yr+36.3%3.9% conv. [**All search terms **](https://flapen.com/research/us/health-household/under-knee-pillow-for-sleeping-on-back/search-terms)
## **Top under knee pillow for sleeping on back 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%$39K10%$77K15%$116K20%$154K101001K10K100K 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**Everlasting Comfort Under Knee Pillow for Back Sleeping - Memory Foam Half Moon Leg Bolster Pillow for Back Pain Thoracic Support**Everlasting Comfort**$29.22**4.5★5,692 rev](https://www.amazon.com/dp/B07NPTXTFV) [2**5 STARS UNITED Knee Pillow for Back Sleeping Half Moon Bolster Pillow for Legs Under Knee Pillow for Sleeping on Back Memory Foam Leg Pillow for Back Pain White**5 STARS UNITED**$33.30**4.4★7,984 rev](https://www.amazon.com/dp/B07HDVHDC2) [3**TranquilRelax Knee Pillow for Back Sleeping Memory Foam Half Moon Bolster Pillow for Legs Under Knee Support Ankle & Foot Comfort Orthopedic Pillow for Side Sleepers (Grey 20.4 x 8 x 4.9)**TranquilRelax**$17.63**4.3★572 rev](https://www.amazon.com/dp/B0DQ7WMR8M) [4**MEGCXIT Leg Pillow Elevation Blood Circulation Leg Wedge for Elevation for Swelling Leg Elevating Pillow for After Surgery Memory Foam Foot Knee Pillow for Back Sleeping 23.616.88 Inch White/Grey**MEGCXIT**$29.76**4.6★2,670 rev](https://www.amazon.com/dp/B0D31CCML3) [5**Knee Pillow for Back Sleeping | Large Half Moon Bolster Pillow for Legs Under Knee Pillow for Sleeping on Back (20.5x 8x 4.5) Leg Pillow for Ankle and Foot Comfort Machine Washable Cover Grey**AllSett Health**$20.12**4.2★3,137 rev](https://www.amazon.com/dp/B085J33H2H)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Vekkia Knee Pillow for Back Sleeping 7 Wedge Pillow for Knees & Leg Versatile Wedge with Dual Handles Comfortable Support for Post-Surgery Lower Back&Hip Pain Relief Blood Circulation Swelling**Vekkia**$29.21**8,923 rev6mo ago](https://www.amazon.com/dp/B0GFTQ7T6Z) [**LVYSHOW Semi Roll Pillow Under Knee Pillow**LVYSHOW**$19.43**57 rev10mo ago](https://www.amazon.com/dp/B0FP15KHJC) [**anzhixiu Half Moon Leg Bolster for Back Sleeping- Adjustable Height Under Knee Pillow for Ankles- Pure Memory Foam Leg Pillow for Sleeping on The Bed- Bubble**anzhixiu**$25.74**93 rev11mo ago](https://www.amazon.com/dp/B0FKGHVH78) [**SweetSlubr Knee Pillow for Side Sleepers Half Moon Memory Foam Bolster Pillow for Legs Ergonomic Design Wedge Elevation Pillow for Side & Back Sleeping Under Knee Support Foot Ankle Lumbar White**SweetSlubr**$17.71**344 rev11mo ago](https://www.amazon.com/dp/B0F9WSBKW8) [**Shinnwa Knee Wedge Pillow Patented Convertible Knee Pillow for Back Sleeping Dual-Layer Memory Foam Triangle Pillow for Legs Post Surgery Knee Support Leg Elevation Back Pain Relief**Shinnwa**$33.72**161 rev1y ago](https://www.amazon.com/dp/B0F3HG7F1M)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Vekkia Knee Pillow for Back Sleeping 7 Wedge Pillow for Knees & Leg Versatile Wedge with Dual Handles Comfortable Support for Post-Surgery Lower Back&Hip Pain Relief Blood Circulation Swelling**Vekkia**$29.21**4.6★**▲ 189%**](https://www.amazon.com/dp/B0GFTQ7T6Z) [**LVYSHOW Semi Roll Pillow Under Knee Pillow**LVYSHOW**$19.43**4.4★**▲ 117%**](https://www.amazon.com/dp/B0FP15KHJC) [**BlissTrends Memory Foam Knee Pillow Knee Pillow for Side Sleepers Leg Pillows for Sleeping Blood Circulation Elevation Pillow for Spine Aligning Sciatica Back Hip Knee Ankle Pain Grey**BlissTrends**$11.29**4.4★**▲ 74%**](https://www.amazon.com/dp/B0CK2JW21V) [**Ruizman Knee Pillow for Back Sleeping - Half Moon Bolster Pillow for Legs - Cooling Under Knee Pillow for Sleeping on Back Leg Support Foot Elevation (Misty Blue)**Ruizman**$24.22**4.3★**▲ 66%**](https://www.amazon.com/dp/B0CZNNPBQL) [**5 STARS UNITED Knee Pillow for Back Sleeping Half Moon Bolster Pillow for Legs Under Knee Pillow for Sleeping on Back Memory Foam Leg Pillow for Back Pain Gray**5 STARS UNITED**$34.41**4.4★**▲ 58%**](https://www.amazon.com/dp/B092JPQD5N)
**~~View all trending →~~**
## **What buyers say about under knee pillow for sleeping on back**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Comfort-Overall**17%
*“Most comfortable”*
**Cushion**12%
*“The cushion is firm”*
**Quality-Overall**12%
*“Good quality, nice cover, good size”*
**Sleep Quality**9%
*“Great sleep”*
**Advertised Vs Actual Product**7%
*“AS ADVERTISED”*
**Size-Overall**7%
*“Good fit”*
**Soft Feel**5%
*“It's very soft”*
**Efficiency**4%
*“It does the job well”*
**Value For Money**4%
*“Great deal”*
**Ease Of Use**3%
*“Easy to use”*
### **What buyers complain about **
**Size-Overall**20%
*“Too big”*
**Hard Feel**13%
*“Not soft enough”*
**Comfort-Overall**11%
*“Not as comfortable as I expected”*
**Cushion**4%
*“Not nearly enough padding”*
**Functionality-Overall**3%
*“Didn't Work For Me”*
**Thickness**3%
*“Felt too thick”*
**Value For Money**3%
*“not good enough for what it costs”*
**Ease Of Use**3%
*“Can't use,returning it”*
**Quality-Overall**2%
*“poor quality Control”*
**Body Support**2%
*“Small and inadequate support”*
### **Top return reasons **
**Size-Overall**27%
**Comfort-Overall**22%
**Cushion**14%
**Functionality-Overall**7%
**Advertised Vs Actual Product**7%
**Hard Feel**4%
**Body Support**3%
**Shape/Style**2%
**Soft Feel**2%
**Thickness**2%
## **Common questions**
- **Is under knee pillow for sleeping on back profitable to sell on Amazon United States?**
- The niche generates $772K/yr across 25 tracked products. 4 of 4 products launched in the last 360 days are still selling. 90-day search growth is -9.7%. Flapen's verdict: Worth a look (55/100).
- **How competitive is the under knee pillow for sleeping on back niche?**
- 22 brands and 27 sellers compete. The top 5 products take 56% of clicks and top 5 brands hold 62% of demand.
- **What do buyers complain about in under knee pillow for sleeping on back?**
- Top complaints mined from reviews: Size-Overall, Hard Feel, Comfort-Overall. The return rate is 3.4%.
- **When does demand for under knee pillow for sleeping on back peak?**
- Demand is steady year-round — the busiest month runs 1.4× the quietest.
- **What does it cost to enter the under knee pillow for sleeping on back niche?**
- Listings span $11.29–$37.30; the average listing price is $26.25 (sweet spot $15–$100). The average incumbent carries 4,039 reviews — the moat a new listing must climb.
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