---
title: "King Size Extra Deep 18-24 Pocket Waterproof Mattress Protector — $139K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/home-kitchen/king-size-extra-deep-18-24-pocket-waterproof-mattress-protector"
last_updated: "2026-08-11T09:33:24.602Z"
locale: en
meta:
description: "Niche score 50/100 · $139K/yr market · 39K searches/yr. A deep review moat (48,159 avg reviews) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 50/100 · $139K/yr market · 39K searches/yr. A deep review moat (48,159 avg reviews) keeps it on the watch list. Data updated Jul 2026."
"og:title": "King Size Extra Deep 18-24 Pocket Waterproof Mattress Protector — $139K/yr Amazon US Niche (2026) - Flapen"
---
# **king size extra deep 18-24 pocket waterproof mattress protector**
**Worth a look**
Shows a sweet-spot price point ($35.85 avg), but a deep review moat (48,159 avg reviews) keeps it on the watch list.
Market size 31Growth 20Conversion 87Competition 51Returns 75Price range 95Avg price 95Brand share 61Review moat 1Quality gap 33
**Avg price**
**Incredible****$35.85**
avg listing price — sweet spot $15–$100
**Price range**
**Incredible****$16.39–$59.75**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Conversion**
**Great****10.0%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Good****2.0%**
return rate — above 5% kills the launch gate
**Brand share**
**Good****68%**
top-5 brand share — brands hold most of the demand
**Competition**
**Good****55%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Okay****4.5★**
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**
**Bad****48,159.17**
avg 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 ~~](https://flapen.com/research/methodology)
## **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.
1K600Spike '26Jan '26Feb '26Mar '26Apr '26May '26Jun '26
[**Open Trend **](https://flapen.com/research/us/home-kitchen/king-size-extra-deep-18-24-pocket-waterproof-mattress-protector/trend)
## **Top king size extra deep 18-24 pocket waterproof mattress protector search terms**
- **king size extra deep 18-24 pocket waterproof mattress protector**12K/yr+5.2%6.6% conv. - **mattress protector king deep pocket**9K/yr-7.5%7.4% conv. - **king size deep pocket mattress protector**7K/yr-26.6%10.5% conv. - **king deep pocket mattress protector**6K/yr-13.0%9.6% conv. - **king size mattress topper waterproof**5K/yr-18.0%4.0% conv. [**All search terms **](https://flapen.com/research/us/home-kitchen/king-size-extra-deep-18-24-pocket-waterproof-mattress-protector/search-terms)
## **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.
0%5%$7K10%$14K15%$21K20%$28K1001K10K100K1.0M 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**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**$27.46**4.6★23,362 rev](https://www.amazon.com/dp/B0C1NQZDYH) [2**PlushDeluxe Bamboo Waterproof Mattress Protector King Size Ultra Soft**PlushDeluxe**$39.07**4.6★42,286 rev](https://www.amazon.com/dp/B07H71SBC4) [3**Premium 100% Waterproof King Mattress Protector Breathable Mattress Cover King Size Bed 3D Air Fabric Cooling Bed Pad Cover Deep Pocket 8-21**MUXHOMO**$19.40**4.5★8,799 rev](https://www.amazon.com/dp/B0BXWJLG9W) [4**GRT King Waterproof Mattress Pad Hollow Cotton Quilted Mattress Protector**GRT**$30.74**4.6★14,378 rev](https://www.amazon.com/dp/B07WTZ3K3C) [5**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**$30.21**4.6★4,464 rev](https://www.amazon.com/dp/B0BBLRKLCK)
**~~View all top sellers →~~**
### **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**$34.43**2,907 rev4mo ago](https://www.amazon.com/dp/B0G2LJ33ML) [**PRIMESOFT King Size Thick Pillow Top Mattress Topper Up to 21 Inch Deep Pocket Soft Breathable for Back Pain Waterproof Protector Cover (White)**Primesoft**$52.48**1,545 rev1y ago](https://www.amazon.com/dp/B0F59N99CS) [**Cooling Waterproof Mattress Protector King Size Mattress Cover 3D Air Fabric Mattress Pad Cover Smooth Soft Breathable Noiseless 8-21 Deep Pocket**Hanherry**$34.21**1,517 rev1y ago](https://www.amazon.com/dp/B0F37MDD6W) [**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**$53.28**12,633 rev1y ago](https://www.amazon.com/dp/B0D3D4WHSF) [**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**$16.39**398 rev2y ago](https://www.amazon.com/dp/B0D9N3YKNL)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**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**$34.43**4.5★**▲ 260%**](https://www.amazon.com/dp/B0G2LJ33ML) [**SafeRest Sleepure Waterproof Mattress Protector King Size - Viscose Derived from Bamboo - Fitted with Stretchable Pockets - Machine Washable Cotton King Mattress Cover for Bed**SafeRest**$39.57**4.6★**▲ 128%**](https://www.amazon.com/dp/B0CFG448PX) [**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**$50.73**4.4★**▲ 126%**](https://www.amazon.com/dp/B07Y252RCV) [**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**$28.56**4.7★**▲ 119%**](https://www.amazon.com/dp/B0CYH5B6T2) [**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**$16.39**4.4★**▲ 26%**](https://www.amazon.com/dp/B0D9N3YKNL)
**~~View all trending →~~**
## **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 **
**Comfort-Overall**21%
*“This mattress pad is soft comfortable”*
**Soft Feel**12%
*“soft to the touch”*
**Size-Overall**11%
*“fits as expected”*
**Quality-Overall**11%
*“Quality mattress cover”*
**Value For Money**6%
*“Fair price”*
**Foam**5%
*“Great for foam mattress”*
**Advertised Vs Actual Product**3%
*“Exactly what I needed”*
**Water Resistance**3%
*“Completely waterproof,”*
**Cushion**2%
*“extra cushion”*
**Sleep Quality**2%
*“Amazing sleep”*
### **What buyers complain about **
**Water Resistance**16%
*“NOT Water proof”*
**Thickness**11%
*“Definitely not as thick as it is advertised”*
**Advertised Vs Actual Product**5%
*“False Advertising”*
**Size-Overall**4%
*“Didn't fit”*
**Leak-Proof**4%
*“Leaked”*
**Quality-Overall**4%
*“Cheap quality”*
**Comfort-Overall**4%
*“Not as comfortable as seems”*
**Cushion**4%
*“provided almost no cushion at all”*
**Value For Money**3%
*“Not worth the price”*
**Fluffiness**3%
*“Not as fluffy”*
### **Top return reasons **
**Size-Overall**22%
**Advertised Vs Actual Product**9%
**Material Quality**9%
**Thickness**7%
**Comfort-Overall**6%
**Cushion**6%
**Thin**5%
**Value For Money**5%
**Quality-Overall**3%
**Noise Level**3%
## **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.
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