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.

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.

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

Good62%

top-5 brand share — brands hold most of the demand

Quality gap

Good4.4★

avg incumbent rating — lower means beatable quality

Conversion

Good5.3%

search→purchase rate — share of searches ending in a sale

Competition

Okay56%

top-5 click share — leaders hold, buyers still browse

Returns

Okay3.4%

return rate — above 5% kills the launch gate

Review moat

Bad4,038.68

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

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

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

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.

No pronounced peak months · busiest ÷ quietest = 1.4×

Open Trend

Top under knee pillow for sleeping on back search terms

knee pillow for back sleeping124K/yr -12.0%5.1% conv.
bolster pillow for legs97K/yr -19.8%3.2% conv.
under knee pillow for sleeping on back49K/yr -10.9%6.2% conv.
under knee pillow41K/yr -12.2%4.2% conv.
half moon pillow30K/yr +0.3%2.0% conv.
knee bolster22K/yr +12.8%3.3% conv.
leg bolster22K/yr -4.5%2.2% conv.
leg pillow for back sleeping25K/yr -19.1%4.5% conv.
knee bolster for sleeping19K/yr -17.7%6.3% conv.
knee pillow for back sleepers18K/yr +36.3%3.9% conv.

All 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.

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

Everlasting Comfort Under Knee Pillow for Back Sleeping - Memory Foam Half Moon Leg Bolster Pillow for Back Pain Thoracic Support

Everlasting Comfort$29.224.5★5,692 rev

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$33.304.4★7,984 rev

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$17.634.3★572 rev

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$29.764.6★2,670 rev

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$20.124.2★3,137 rev

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$29.218,923 rev

6mo ago

LVYSHOW Semi Roll Pillow Under Knee Pillow

LVYSHOW$19.4357 rev

10mo ago

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$25.7493 rev

11mo ago

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$17.71344 rev

11mo ago

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$33.72161 rev

1y ago

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-Overall17%

“Most comfortable”

Cushion12%

“The cushion is firm”

Quality-Overall12%

“Good quality, nice cover, good size”

Sleep Quality9%

“Great sleep”

Advertised Vs Actual Product7%

“AS ADVERTISED”

Size-Overall7%

“Good fit”

Soft Feel5%

“It's very soft”

Efficiency4%

“It does the job well”

Value For Money4%

“Great deal”

Ease Of Use3%

“Easy to use”

What buyers complain about

Size-Overall20%

“Too big”

Hard Feel13%

“Not soft enough”

Comfort-Overall11%

“Not as comfortable as I expected”

Cushion4%

“Not nearly enough padding”

Functionality-Overall3%

“Didn't Work For Me”

Thickness3%

“Felt too thick”

Value For Money3%

“not good enough for what it costs”

Ease Of Use3%

“Can't use,returning it”

Quality-Overall2%

“poor quality Control”

Body Support2%

“Small and inadequate support”

Top return reasons

Size-Overall27%

Comfort-Overall22%

Cushion14%

Functionality-Overall7%

Advertised Vs Actual Product7%

Hard Feel4%

Body Support3%

Shape/Style2%

Soft Feel2%

Thickness2%

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.