king size mattress protector
Worth a lookShows searches that convert (12.6% search→purchase), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Conversion
Incredible12.6%search→purchase rate — share of searches ending in a sale
Returns
Incredible0.9%return rate — above 5% kills the launch gate
Market size
Great£1.0M£1.0M/yr · 667K searches
Brand share
Good64%top-5 brand share — brands hold most of the demand
Competition
Good49%top-5 click share — leaders hold, buyers still browse
Avg price
Good£12.15avg listing price — sweet spot $15–$100
Price range
Okay£6.64–£22.61cheapest to priciest tracked listing — scored on the share inside $15–$100
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Growth
Bad-12.0%90-day search growth — must beat 0% to launch
Review moat
Bad18,561.94avg 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
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.No pronounced peak months · busiest ÷ quietest = 1.3×
Top king size mattress protector search terms
- king size mattress protector258K/yr
- mattress protector king size116K/yr
- mattress protector kingsize bed59K/yr
- kingsize mattress protectors47K/yr
- king mattress protector36K/yr
- king size mattress cover25K/yr
- mattress cover king size bed23K/yr
- mattress king size protector17K/yr
- mattress protector king19K/yr
- kingsize mattress protector14K/yr
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.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Caroline Shatuik King Size Mattress Protector fitted Quilted Extra Deep 40cm Stretch Skirt Anti Allergy Mattress Cover (152 x 200) Not-Waterproof
CAROLINE SHATUIK£10.384.5★7,499 rev
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£9.894.5★11,349 rev
Aaf Textiles King Quilted Mattress Protector Anti Allergy Extra Deep Pocket Fitted Hypoallergenic Hotel Quality Super Soft Brushed Fabric White
Aaf Textiles£9.544.4★5,705 rev
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£8.204.5★157,536 rev
Moonlight Bedding King Size Mattress Protector - 30cm Deep Hotel Quality Mattress Cover Soft & Breathable Mattress Topper(150x200+30cm)
MOONLIGHT20015£8.164.3★770 rev
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£18.6135 rev
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£10.6581 rev
Salt Valley Quilted King Size Mattress Protector Extra Deep 30cm Fitted Skirt Anti-Allergenic & Machine Washable Microfiber Mattress Cover (White 152x200 cm)
Salt Valley£17.70152 rev
LOOMERIG Hypoallergenic King Size Mattress Protector (152x200cm) - Extra Deep Fitted Quilted Mattress Protector for Comfortable Sleep
LOOMERIG£14.45206 rev
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£10.30680 rev
Trending
90-day click momentumUNIVERSAL 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£18.614.8★
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£10.654.4★
PlushDeluxe Premium Bamboo Mattress Protector Waterproof Hypoallergenic & Ultra Soft Breathable Bed Mattress Cover & Protection -Free PVC Phthalate (UK King Size) White
PlushDeluxe£22.614.5★
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£7.484.6★
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£12.274.5★
What buyers say about king size mattress protector
What buyers praise and complain about, mined from review topics.What buyers love
“EXCELLENT QUALITY”
“Easy fit”
“Cheap price”
“As advertised”
“So comfortable”
“Nice and soft material”
“very waterproof”
“Effective mattress protector”
“doesnt make any noise”
“Nice wit added padding for comfort”
What buyers complain about
“the quality control just isn't there”
“Quite a thin item”
“No longer waterproof after washing”
“it was far too small”
“Photos are misleading”
“Material doesnt feel good quality”
“Made a noise when moving around in bed”
“uncomfortable”
“it does leak”
“definitely not the padding depth it states”
Top return reasons
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.