---
title: "King Size Mattress Protector — £1.0M/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/home-garden/king-size-mattress-protector"
last_updated: "2026-08-01T04:02:08.265Z"
locale: en
meta:
description: "Niche score 60/100 · £1.0M/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 60/100 · £1.0M/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "King Size Mattress Protector — £1.0M/yr Amazon UK Niche (2026) - Flapen"
---
# **king size mattress protector**
**Worth a look**
Shows searches that convert (12.6% search→purchase), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 78Growth 19Conversion 95Competition 59Returns 95Price range 48Avg price 51Brand share 69Review moat 17Quality gap 45
**Conversion**
**Incredible****12.6%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Incredible****0.9%**
return rate — above 5% kills the launch gate
**Market size**
**Great****£1.0M**
£1.0M/yr · 667K searches
**Brand share**
**Good****64%**
top-5 brand share — brands hold most of the demand
**Competition**
**Good****49%**
top-5 click share — leaders hold, buyers still browse
**Avg price**
**Good****£12.15**
avg listing price — sweet spot $15–$100
**Price range**
**Okay****£6.64–£22.61**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Growth**
**Bad****-12.0%**
90-day search growth — must beat 0% to launch
**Review moat**
**Bad****18,561.94**
avg incumbent reviews — the moat a new listing must climb
According to Flapen's Amazon United Kingdom niche tracking, king size mattress protector is a £1.0M/yr Amazon United Kingdom market (667K searches/yr). The top 5 brands hold 64% of demand. Verdict: Worth a look — 60/100.
Data updated Jul 28, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **king size mattress protector market data**
- **Units sold / yr**
- **80K–100K**
- avg 2,500–3,000/product
- **Revenue / yr**
- **£972K–£1.2M**
- units × avg price
- **Conversion rate**
- **12.6%**
- **Avg BSR**
- **#37**
- **Page quality**
- **0%**
- **Prime**
- **77%**
- **Sponsored**
- **97%**
- **Out of stock**
- **5.0%**
- **Avg brand age**
- **52 months**
- **Avg seller age**
- **186 days**
## **Competition & brand share**
The top 5 products take 49% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**21 **▲rising
**Sellers**
**34**
**Top-5 brand share**
**64%**
Top 20: 99%
**Top-5 click share**
**49%**
Top 20: 89%
**Open market**
**31%**
- CAROLINE SHATUIK30% - Utopia Bedding12% - Aaf Textiles9% - Silentnight7% - ACRALI HOME6% - 4AS6%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -12.0% search growth over the last 90 days.
18K13KSpike '24Prime Day '25 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.3×
[**Open Trend **](https://flapen.com/research/uk/home-garden/king-size-mattress-protector/trend)
## **Top king size mattress protector search terms**
- **king size mattress protector**258K/yr-10.5%12.2% conv. - **mattress protector king size**116K/yr-10.4%9.2% conv. - **mattress protector kingsize bed**59K/yr-22.5%9.0% conv. - **kingsize mattress protectors**47K/yr-9.6%11.9% conv. - **king mattress protector**36K/yr-6.9%12.8% conv. - **king size mattress cover**25K/yr-11.4%3.4% conv. - **mattress cover king size bed**23K/yr-9.4%4.3% conv. - **mattress king size protector**17K/yr-29.1%10.1% conv. - **mattress protector king**19K/yr-3.8%8.7% conv. - **kingsize mattress protector**14K/yr-9.5%7.9% conv. [**All search terms **](https://flapen.com/research/uk/home-garden/king-size-mattress-protector/search-terms)
## **Top king size 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%4%£41K8%£82K12%£122K16%£163K101001K10K100K1.0M 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**Caroline Shatuik King Size Mattress Protector fitted Quilted Extra Deep 40cm Stretch Skirt Anti Allergy Mattress Cover (152 x 200) Not-Waterproof**CAROLINE SHATUIK**£10.38**4.5★7,499 rev](https://www.amazon.co.uk/dp/B08Z1R13VS) [2**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) [3**Aaf Textiles King Quilted Mattress Protector Anti Allergy Extra Deep Pocket Fitted Hypoallergenic Hotel Quality Super Soft Brushed Fabric White**Aaf Textiles**£9.54**4.4★5,705 rev](https://www.amazon.co.uk/dp/B0719M2Z5H) [4**Utopia Bedding Quilted Mattress Topper King Bed Mattress Protector Cover Quilted Pad Soft Breathable Deep Fitted Elastic King 150 x 200 + 38 cm White**Utopia Bedding**£8.20**4.5★157,536 rev](https://www.amazon.co.uk/dp/B07FLTSBW8) [5**Moonlight Bedding King Size Mattress Protector - 30cm Deep Hotel Quality Mattress Cover Soft & Breathable Mattress Topper(150x200+30cm)**MOONLIGHT20015**£8.16**4.3★770 rev](https://www.amazon.co.uk/dp/B0BWY6N5PM)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**UNIVERSAL COMFORT 100% Waterproof Mattress Protector King Size Extra Deep 40cm Fitted Stretch Skirt - Breathable & Anti-Allergy Mattress Cover For Ultimate Comfort (King 150x200cm)**UNIVERSAL COMFORT**£18.61**35 rev5mo ago](https://www.amazon.co.uk/dp/B0GMJ6NY6K) [**Magna Collection Waterproof Mattress Protector Soft Super Absorbent Non-Slip and Non-Allergenic Machine Washable Mattress Cover Fits up to 30cm Deep (King)**MAGNA COLLECTION**£10.65**81 rev11mo ago](https://www.amazon.co.uk/dp/B0FMK78WYP) [**Salt Valley Quilted King Size Mattress Protector Extra Deep 30cm Fitted Skirt Anti-Allergenic & Machine Washable Microfiber Mattress Cover (White 152x200 cm)**Salt Valley**£17.70**152 rev11mo ago](https://www.amazon.co.uk/dp/B0FLVR53JY) [**LOOMERIG Hypoallergenic King Size Mattress Protector (152x200cm) - Extra Deep Fitted Quilted Mattress Protector for Comfortable Sleep**LOOMERIG**£14.45**206 rev1y ago](https://www.amazon.co.uk/dp/B0DT44XG8V) [**Acrali Home Quilted King Size Mattress Protector UltraSoft 3-Layer Design with Deep Fitted Skirt Breathable & Anti-Allergy Machine Washable Bed Cover (150x200+35cm)**ACRALI HOME**£10.30**680 rev1y ago](https://www.amazon.co.uk/dp/B0DNQTYLS8)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**UNIVERSAL COMFORT 100% Waterproof Mattress Protector King Size Extra Deep 40cm Fitted Stretch Skirt - Breathable & Anti-Allergy Mattress Cover For Ultimate Comfort (King 150x200cm)**UNIVERSAL COMFORT**£18.61**4.8★**▲ 159%**](https://www.amazon.co.uk/dp/B0GMJ6NY6K) [**Magna Collection Waterproof Mattress Protector Soft Super Absorbent Non-Slip and Non-Allergenic Machine Washable Mattress Cover Fits up to 30cm Deep (King)**MAGNA COLLECTION**£10.65**4.4★**▲ 120%**](https://www.amazon.co.uk/dp/B0FMK78WYP) [**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★**▲ 116%**](https://www.amazon.co.uk/dp/B07HC2WHS1) [**Waterproof Mattress Protector King 150 x 200 cm Fits Up to 30 cm Deep Mattresses Premium Terry King Mattress Protector All Around Elastic King Mattress Cover by Utopia Bedding**Utopia Bedding**£7.48**4.6★**▲ 102%**](https://www.amazon.co.uk/dp/B09Q57M9B4) [**4AS Quilted King Size Mattress Protector 110 GSM Microfiber Filling Hypoallergenic Deep Fitted Breathable Mattress Topper Stretches up to 30 cm (King - 150x200 cm)**4AS**£12.27**4.5★**▲ 102%**](https://www.amazon.co.uk/dp/B0D3XV81M5)
**~~View all trending →~~**
## **What buyers say about king size mattress protector**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**26%
*“EXCELLENT QUALITY”*
**Size-Overall**22%
*“Easy fit”*
**Value For Money**11%
*“Cheap price”*
**Advertised Vs Actual Product**6%
*“As advertised”*
**Comfort-Overall**4%
*“So comfortable”*
**Soft Feel**4%
*“Nice and soft material”*
**Water Resistance**4%
*“very waterproof”*
**Foam**3%
*“Effective mattress protector”*
**Noise Level**2%
*“doesnt make any noise”*
**Cushion**2%
*“Nice wit added padding for comfort”*
### **What buyers complain about **
**Quality-Overall**13%
*“the quality control just isn't there”*
**Thickness**13%
*“Quite a thin item”*
**Water Resistance**11%
*“No longer waterproof after washing”*
**Size-Overall**9%
*“it was far too small”*
**Advertised Vs Actual Product**3%
*“Photos are misleading”*
**Material Quality**3%
*“Material doesnt feel good quality”*
**Noise Level**3%
*“Made a noise when moving around in bed”*
**Comfort-Overall**3%
*“uncomfortable”*
**Leak-Proof**2%
*“it does leak”*
**Cushion**2%
*“definitely not the padding depth it states”*
### **Top return reasons **
**Size-Overall**38%
**Material Quality**11%
**Quality-Overall**11%
**Water Resistance**9%
**Thin**7%
**Noise Level**4%
**Advertised Vs Actual Product**4%
**Thickness**3%
**Stain Resistance**2%
**Cushion**2%
## **Common questions**
- **Is king size mattress protector profitable to sell on Amazon United Kingdom?**
- The niche generates £1.0M/yr across 31 tracked products. 3 of 5 products launched in the last 360 days are still selling. 90-day search growth is -12.0%. Flapen's verdict: Worth a look (60/100).
- **How competitive is the king size mattress protector niche?**
- 21 brands and 34 sellers compete. The top 5 products take 49% of clicks and top 5 brands hold 64% of demand.
- **What do buyers complain about in king size mattress protector?**
- Top complaints mined from reviews: Quality-Overall, Thickness, Water Resistance. The return rate is 0.9%.
- **When does demand for king size mattress protector peak?**
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- **What does it cost to enter the king size mattress protector niche?**
- Listings span £6.64–£22.61; the average listing price is £12.15 (sweet spot $15–$100). The average incumbent carries 18,562 reviews — the moat a new listing must climb.
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