king size extra deep 18-24 pocket waterproof mattress protector
Worth a lookShows a sweet-spot price point ($35.85 avg), but a deep review moat (48,159 avg reviews) keeps it on the watch list.
Avg price
Incredible$35.85avg listing price — sweet spot $15–$100
Price range
Incredible$16.39–$59.75cheapest to priciest tracked listing — scored on the share inside $15–$100
Conversion
Great10.0%search→purchase rate — share of searches ending in a sale
Returns
Good2.0%return rate — above 5% kills the launch gate
Brand share
Good68%top-5 brand share — brands hold most of the demand
Competition
Good55%top-5 click share — leaders hold, buyers still browse
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Market size
Okay$139K$139K/yr · 39K searches
Growth
Bad-10.3%90-day search growth — must beat 0% to launch
Review moat
Bad48,159.17avg incumbent reviews — the moat a new listing must climb
According to Flapen's Amazon United States niche tracking, king size extra deep 18-24 pocket waterproof mattress protector is a $139K/yr Amazon United States market (39K searches/yr). The top 5 brands hold 68% of demand. Verdict: Worth a look — 50/100.
Data updated Jul 29, 2026 · scored weekly · How we score niches
king size extra deep 18-24 pocket waterproof mattress protector market data
- Units sold / yr
- 3K–4K
- avg 100–250/product
- Revenue / yr
- $108K–$143K
- units × avg price
- Conversion rate
- 10.0%
- Avg BSR
- #23
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 96%
- Out of stock
- 0.0%
- Avg brand age
- 54 months
- Avg seller age
- 187 days
Competition & brand share
The top 5 products take 55% of clicks — established leaders, but buyers still shop beyond them.Brands
16 falling
Sellers
24
Top-5 brand share
68%
Top 20: 100%
Top-5 click share
55%
Top 20: 96%
Open market
27%
- BEDLORE28%
- GRT13%
- PlushDeluxe11%
- MUXHOMO11%
- SafeRest6%
- Cozymaker5%
Demand
Weekly Amazon search volume, last 30 weeks — -10.3% search growth over the last 90 days.Top king size extra deep 18-24 pocket waterproof mattress protector search terms
- king size extra deep 18-24 pocket waterproof mattress protector12K/yr
- mattress protector king deep pocket9K/yr
- king size deep pocket mattress protector7K/yr
- king deep pocket mattress protector6K/yr
- king size mattress topper waterproof5K/yr
Top king size extra deep 18-24 pocket waterproof mattress protector 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
BEDLORE Waterproof Mattress Protector King Size Mattress Pad with Deep Pocket 6-18 Depth Soft Noiseless Dirt-Proof Bed Mattress Cover Washable for Home Bedroom Hotel (Gray)
BEDLORE$27.464.6★23,362 rev
PlushDeluxe Bamboo Waterproof Mattress Protector King Size Ultra Soft
PlushDeluxe$39.074.6★42,286 rev
Premium 100% Waterproof King Mattress Protector Breathable Mattress Cover King Size Bed 3D Air Fabric Cooling Bed Pad Cover Deep Pocket 8-21
MUXHOMO$19.404.5★8,799 rev
GRT King Waterproof Mattress Pad Hollow Cotton Quilted Mattress Protector
GRT$30.744.6★14,378 rev
Cozymaker King Size 100% Waterproof Mattress Protector Cooling Mattress Cover Fitted 8-21 Deep Pocket 3D Air Fabric Soft Breathable Bed Mattress Pad Cover Noiseless Washable
Cozymaker$30.214.6★4,464 rev
Newest
by launch date
Ultra Soft Waterproof Mattress Protector King - 6-21 Deep Pocket with Leak-Proof Edge Protection - Noiseless & Cooling Soft-Touch Viscose Made from Bamboo - Machine Washable (White)
Niagara Sleep Solution$34.432,907 rev
PRIMESOFT King Size Thick Pillow Top Mattress Topper Up to 21 Inch Deep Pocket Soft Breathable for Back Pain Waterproof Protector Cover (White)
Primesoft$52.481,545 rev
Cooling Waterproof Mattress Protector King Size Mattress Cover 3D Air Fabric Mattress Pad Cover Smooth Soft Breathable Noiseless 8-21 Deep Pocket
Hanherry$34.211,517 rev
BEDLORE King Mattress Topper Viscose Derived from Bamboo Thick Pillow Top Mattress Pad with Stretchable Pockets for 6-18 Mattress Soft Breathable Mattress Topper for Back Pain Relief(Dark Gray)
BEDLORE$53.2812,633 rev
OhGeni Waterproof Mattress Protector King Size Mattress Pad Fitted with Deep Pocket 6-18 Breathable Noiseless & Soft Washable Dirt-Proof Mattress Cover for Home Hotel White Daybed Cover
OhGeni$16.39398 rev
Trending
90-day click momentumUltra Soft Waterproof Mattress Protector King - 6-21 Deep Pocket with Leak-Proof Edge Protection - Noiseless & Cooling Soft-Touch Viscose Made from Bamboo - Machine Washable (White)
Niagara Sleep Solution$34.434.5★
SafeRest Sleepure Waterproof Mattress Protector King Size - Viscose Derived from Bamboo - Fitted with Stretchable Pockets - Machine Washable Cotton King Mattress Cover for Bed
SafeRest$39.574.6★
Niagara Sleep Solution Ultra Soft King Size Mattress Topper - Rayon Derived from Bamboo Pillow Top Mattress Pad for Back Pain Relief - Naturally Cooling for Hot Sleepers Green
Niagara Sleep Solution$50.734.4★
BEDLORE King Mattress Protector Waterproof Noiseless Mattress Cover with Deep Pocket for 6-18 inches Mattress Soft Breathable Mattress Pad Machine Washable (Dark Gray)
BEDLORE$28.564.7★
OhGeni Waterproof Mattress Protector King Size Mattress Pad Fitted with Deep Pocket 6-18 Breathable Noiseless & Soft Washable Dirt-Proof Mattress Cover for Home Hotel White Daybed Cover
OhGeni$16.394.4★
What buyers say about king size extra deep 18-24 pocket waterproof mattress protector
What buyers praise and complain about, mined from review topics.What buyers love
“This mattress pad is soft comfortable”
“soft to the touch”
“fits as expected”
“Quality mattress cover”
“Fair price”
“Great for foam mattress”
“Exactly what I needed”
“Completely waterproof,”
“extra cushion”
“Amazing sleep”
What buyers complain about
“NOT Water proof”
“Definitely not as thick as it is advertised”
“False Advertising”
“Didn't fit”
“Leaked”
“Cheap quality”
“Not as comfortable as seems”
“provided almost no cushion at all”
“Not worth the price”
“Not as fluffy”
Top return reasons
Common questions
- Is king size extra deep 18-24 pocket waterproof mattress protector profitable to sell on Amazon United States?
- The niche generates $139K/yr across 24 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -10.3%. Flapen's verdict: Worth a look (50/100).
- How competitive is the king size extra deep 18-24 pocket waterproof mattress protector niche?
- 16 brands and 24 sellers compete. The top 5 products take 55% of clicks and top 5 brands hold 68% of demand.
- What do buyers complain about in king size extra deep 18-24 pocket waterproof mattress protector?
- Top complaints mined from reviews: Water Resistance, Thickness, Advertised Vs Actual Product. The return rate is 2.0%.
- What does it cost to enter the king size extra deep 18-24 pocket waterproof mattress protector niche?
- Listings span $16.39–$59.75; the average listing price is $35.85 (sweet spot $15–$100). The average incumbent carries 48,159 reviews — the moat a new listing must climb.