---
title: "Waterproof Mattress Protector King Size — £267K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/home-garden/waterproof-mattress-protector-king-size"
last_updated: "2026-07-31T13:08:37.595Z"
locale: en
meta:
description: "Niche score 50/100 · £267K/yr market · 163K searches/yr. A deep review moat (22,651 avg reviews) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 50/100 · £267K/yr market · 163K searches/yr. A deep review moat (22,651 avg reviews) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Waterproof Mattress Protector King Size — £267K/yr Amazon UK Niche (2026) - Flapen"
---
# **waterproof mattress protector king size**
**Worth a look**
Shows searches that convert (14.3% search→purchase), but a deep review moat (22,651 avg reviews) keeps it on the watch list.
Market size 49Growth 21Conversion 96Competition 47Returns 96Price range 48Avg price 45Brand share 43Review moat 15Quality gap 37
**Conversion**
**Incredible****14.3%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Incredible****0.8%**
return rate — above 5% kills the launch gate
**Market size**
**Okay****£267K**
£267K/yr · 163K searches
**Price range**
**Okay****£6.70–£22.61**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Competition**
**Okay****57%**
top-5 click share — leaders hold, buyers still browse
**Avg price**
**Okay****£11.43**
avg listing price — sweet spot $15–$100
**Brand share**
**Okay****79%**
top-5 brand share — brands hold most of the demand
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Growth**
**Bad****-8.5%**
90-day search growth — must beat 0% to launch
**Review moat**
**Bad****22,651.3**
avg incumbent reviews — the moat a new listing must climb
According to Flapen's Amazon United Kingdom niche tracking, waterproof mattress protector king size is a £267K/yr Amazon United Kingdom market (163K searches/yr). The top 5 brands hold 79% of demand. Verdict: Worth a look — 50/100.
Data updated Jul 28, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **waterproof mattress protector king size market data**
- **Units sold / yr**
- **25K–30K**
- avg 1,250–1,500/product
- **Revenue / yr**
- **£286K–£343K**
- units × avg price
- **Conversion rate**
- **14.3%**
- **Avg BSR**
- **#21**
- **Page quality**
- **0%**
- **Prime**
- **65%**
- **Sponsored**
- **91%**
- **Out of stock**
- **1.9%**
- **Avg brand age**
- **46 months**
- **Avg seller age**
- **190 days**
## **Competition & brand share**
The top 5 products take 57% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**14 **▲rising
**Sellers**
**22**
**Top-5 brand share**
**79%**
Top 20: 100%
**Top-5 click share**
**57%**
Top 20: 96%
**Open market**
**17%**
- Utopia Bedding25% - CAROLINE SHATUIK25% - Silentnight11% - ACRALI HOME11% - IMFAA8% - Oliver Bedding4% - Open — no brand owns it (8 brands, 17%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -8.5% search growth over the last 90 days.
4K3KSpike '24Prime Day '25Spike '25 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.3×
[**Open Trend **](https://flapen.com/research/uk/home-garden/waterproof-mattress-protector-king-size/trend)
## **Top waterproof mattress protector king size search terms**
- **king size waterproof mattress protector**38K/yr-9.9%14.4% conv. - **waterproof mattress protector king size**37K/yr-7.8%11.9% conv. - **king size mattress protector waterproof**19K/yr-11.9%12.3% conv. - **waterproof mattress protector king**14K/yr-9.7%11.7% conv. - **waterproof king size mattress protector**8K/yr-6.5%12.3% conv. - **kingsize waterproof mattress protector fitted**10K/yr-11.1%13.7% conv. - **water proof mattress protector king size bed fitted**6K/yr+7.3%8.2% conv. - **king-size waterproof mattress protector**5K/yr-9.2%12.3% conv. - **king waterproof mattress protector**4K/yr-4.3%14.4% conv. - **king size waterproof sheet**3K/yr+6.5%9.6% conv. [**All search terms **](https://flapen.com/research/uk/home-garden/waterproof-mattress-protector-king-size/search-terms)
## **Top waterproof mattress protector king size 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%10%£27K20%£53K30%£80K40%£107K101001K10K100K1.0M Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 23 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Caroline Shatuik Waterproof Mattress Protector King |40cm Extra Deep Fitted King Size Waterproof Bed Protector Topper | Non Noisy & Breathable Mattress Cover King Size Bed(152 X 200 +40CM)**CAROLINE SHATUIK**£9.89**4.5★11,349 rev](https://www.amazon.co.uk/dp/B09TTZ7G2W) [2**Silentnight Waterproof Mattress Protector King - Quiet Rustle Free Waterproof Resistant Sheet Moisture Proof Mattress Pad Cover - Machine Washable and Hypoallergenic - King**Silentnight**£13.65**4.5★3,713 rev](https://www.amazon.co.uk/dp/B08FRFKTSN) [3**Acrali Home 100% Waterproof Mattress Protector King Size Bed Fitted Extra Deep 40cm Skirt Premium Terry Cotton Hypoallergenic King Size Mattress Protector 150x200cm - Washable Nonslip Cover Sheet**ACRALI HOME**£10.66**4.5★1,725 rev](https://www.amazon.co.uk/dp/B0D278Q9V7) [4**Waterproof Mattress Protector King Bed 150 x 200 cm Fits Up to 40 cm Deep Mattresses Premium Terry Mattress Protector by Utopia Bedding**Utopia Bedding**£7.51**4.6★108,982 rev](https://www.amazon.co.uk/dp/B077T9VSNZ) [5**Utopia Bedding Premium Waterproof Mattress Encasement King Bed (150 x 200 x 30 cm) Zippered Mattress Protector Bed Bug & Dust Mite Proof White (Pack of 1)**Utopia Bedding**£10.52**4.5★12,841 rev](https://www.amazon.co.uk/dp/B077T5TQL9)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**BEDLORE Waterproof King Size Mattress Protector Brushed Microfiber with Upgraded TPU Layer Deep Pocket Hypoallergenic Breathable Noiseless Oeko-tex Mattresses Cover (White)**BEDLORE**£21.33**951 rev7mo ago](https://www.amazon.co.uk/dp/B0FLPYLQGG) [**HUAXITRA Waterproof Mattress Protector King Size Bed with 30CM Extra Deep Skirt Fitted Sheet Protects King Size Mattress Protector Anti Allergy Breathable Mattress Bed Sheet Covers (150x200cm)**HUAXITRA**£16.48**69 rev1y ago](https://www.amazon.co.uk/dp/B0FDB69S3R) [**Waterproof Mattress Protector King Size Quilted King Mattress Protectors Fits Mattresses up to 30cm Deep Breathable Super King Topper-White**Oliver Bedding**£10.80**555 rev1y ago](https://www.amazon.co.uk/dp/B0DHD5BDV9) [**4AS 100% Waterproof Mattress Protector Super Absorbent & Aloe Vera Treated Terry Towel with Deep 30cm Fitted Skirt for Extra Comfort King Size Mattress Protector (150x200+30 cm)**4AS**£11.12**95 rev2y ago](https://www.amazon.co.uk/dp/B0D54G7WKQ) [**Acrali Home 100% Waterproof Mattress Protector King Size Bed Fitted Extra Deep 40cm Skirt Premium Terry Cotton Hypoallergenic King Size Mattress Protector 150x200cm - Washable Nonslip Cover Sheet**ACRALI HOME**£10.66**1,725 rev2y ago](https://www.amazon.co.uk/dp/B0D278Q9V7)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Utopia Bedding Waterproof Mattress Protector 180 x 200 cm for Mattresses up to 30 cm High Lightweight and Soft Jersey Mattress Cover with Stretchable Sides - White**Utopia Bedding**£8.04**4.4★**▲ 276%**](https://www.amazon.co.uk/dp/B0CYH3XPDS) [**ECOBIZ 100% Waterproof Mattress Protector King Size Bed 152x200 Extra Deep 30CM Fitted Skirt Soft Super Absorbent Non-noisy Cotton Terry Cover Breathable Hypoallergenic Washable Kingsize Sheet**ECOBIZ**£10.71**4.4★**▲ 179%**](https://www.amazon.co.uk/dp/B09X1CTY61) [**4AS 100% Waterproof Mattress Protector Super Absorbent & Aloe Vera Treated Terry Towel with Deep 30cm Fitted Skirt for Extra Comfort King Size Mattress Protector (150x200+30 cm)**4AS**£11.12**4.6★**▲ 161%**](https://www.amazon.co.uk/dp/B0D54G7WKQ) [**BEDLORE Waterproof King Size Mattress Protector Brushed Microfiber with Upgraded TPU Layer Deep Pocket Hypoallergenic Breathable Noiseless Oeko-tex Mattresses Cover (White)**BEDLORE**£21.33**4.8★**▲ 141%**](https://www.amazon.co.uk/dp/B0FLPYLQGG) [**PlushDeluxe Premium Bamboo Mattress Protector Waterproof Hypoallergenic & Ultra Soft Breathable Bed Mattress Cover & Protection -Free PVC Phthalate (UK King Size) White**PlushDeluxe**£22.61**4.5★**▲ 111%**](https://www.amazon.co.uk/dp/B07HC2WHS1)
**~~View all trending →~~**
## **What buyers say about waterproof mattress protector king size**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**23%
*“Seems well made”*
**Size-Overall**21%
*“Easy fit”*
**Advertised Vs Actual Product**8%
*“Just what I needed”*
**Value For Money**8%
*“Excellent price”*
**Water Resistance**7%
*“Completely waterproof”*
**Noise Level**4%
*“its not noisy or anything like that”*
**Soft Feel**4%
*“Nice and soft material”*
**Comfort-Overall**3%
*“So comfortable”*
**Ease Of Cleaning**3%
*“Easy to wash”*
**Foam**2%
*“Best Mattress Protector”*
### **What buyers complain about **
**Water Resistance**26%
*“Not water proof”*
**Size-Overall**10%
*“it was far too small”*
**Quality-Overall**9%
*“the quality control just isn't there”*
**Noise Level**5%
*“Made a noise when moving around in bed”*
**Material Quality**5%
*“Its not 100% cotton”*
**Comfort-Overall**5%
*“uncomfortable”*
**Thickness**3%
*“Quite a thin item”*
**Thin**2%
*“Good although quite thin”*
**Grip**2%
*“Grippy texture”*
**Absorbency**2%
*“Not sure how absorbent they would be for large amount”*
### **Top return reasons **
**Size-Overall**53%
**Quality-Overall**11%
**Material Quality**9%
**Noise Level**5%
**Water Resistance**4%
**Advertised Vs Actual Product**3%
**Thickness**2%
**Thin**1%
**Comfort-Overall**1%
**Stain Resistance**1%
## **Common questions**
- **Is waterproof mattress protector king size profitable to sell on Amazon United Kingdom?**
- The niche generates £267K/yr across 23 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -8.5%. Flapen's verdict: Worth a look (50/100).
- **How competitive is the waterproof mattress protector king size niche?**
- 14 brands and 22 sellers compete. The top 5 products take 57% of clicks and top 5 brands hold 79% of demand.
- **What do buyers complain about in waterproof mattress protector king size?**
- Top complaints mined from reviews: Water Resistance, Size-Overall, Quality-Overall. The return rate is 0.8%.
- **When does demand for waterproof mattress protector king size peak?**
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- **What does it cost to enter the waterproof mattress protector king size niche?**
- Listings span £6.70–£22.61; the average listing price is £11.43 (sweet spot $15–$100). The average incumbent carries 22,651 reviews — the moat a new listing must climb.
## **Related niches in Home & Garden**
- 79 [**mole repellent**](https://flapen.com/research/uk/home-garden/mole-repellent)£163K/yr+91.4%**Worth a look**- 80 [**sun lounger**](https://flapen.com/research/uk/home-garden/sun-lounger)£2.5M/yr+299.9%**Launch it**- 80 [**fly repellent fan**](https://flapen.com/research/uk/home-garden/fly-repellent-fan)£302K/yr>1,000%**Worth a look**- 80 [**ice maker**](https://flapen.com/research/uk/home-garden/ice-maker)£2.9M/yr+371.4%**Launch it**- 80 [**parasol base**](https://flapen.com/research/uk/home-garden/parasol-base)£1.1M/yr+904.4%**Launch it**- 80 [**air conditioner**](https://flapen.com/research/uk/home-garden/air-conditioner)£39.3M/yr>1,000%**Launch it**[**All Home & Garden niches **](https://flapen.com/research/uk/home-garden)