waterproof mattress protector king size
Worth a lookShows searches that convert (14.3% search→purchase), but a deep review moat (22,651 avg reviews) keeps it on the watch list.
Conversion
Incredible14.3%search→purchase rate — share of searches ending in a sale
Returns
Incredible0.8%return rate — above 5% kills the launch gate
Market size
Okay£267K£267K/yr · 163K searches
Price range
Okay£6.70–£22.61cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
Okay57%top-5 click share — leaders hold, buyers still browse
Avg price
Okay£11.43avg listing price — sweet spot $15–$100
Brand share
Okay79%top-5 brand share — brands hold most of the demand
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Growth
Bad-8.5%90-day search growth — must beat 0% to launch
Review moat
Bad22,651.3avg 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
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.No pronounced peak months · busiest ÷ quietest = 1.3×
Top waterproof mattress protector king size search terms
- king size waterproof mattress protector38K/yr
- waterproof mattress protector king size37K/yr
- king size mattress protector waterproof19K/yr
- waterproof mattress protector king14K/yr
- waterproof king size mattress protector8K/yr
- kingsize waterproof mattress protector fitted10K/yr
- water proof mattress protector king size bed fitted6K/yr
- king-size waterproof mattress protector5K/yr
- king waterproof mattress protector4K/yr
- king size waterproof sheet3K/yr
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.
All 23 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
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
Silentnight Waterproof Mattress Protector King - Quiet Rustle Free Waterproof Resistant Sheet Moisture Proof Mattress Pad Cover - Machine Washable and Hypoallergenic - King
Silentnight£13.654.5★3,713 rev
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£10.664.5★1,725 rev
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£7.514.6★108,982 rev
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£10.524.5★12,841 rev
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£21.33951 rev
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£16.4869 rev
Waterproof Mattress Protector King Size Quilted King Mattress Protectors Fits Mattresses up to 30cm Deep Breathable Super King Topper-White
Oliver Bedding£10.80555 rev
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£11.1295 rev
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£10.661,725 rev
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£8.044.4★
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£10.714.4★
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£11.124.6★
BEDLORE Waterproof King Size Mattress Protector Brushed Microfiber with Upgraded TPU Layer Deep Pocket Hypoallergenic Breathable Noiseless Oeko-tex Mattresses Cover (White)
BEDLORE£21.334.8★
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★
What buyers say about waterproof mattress protector king size
What buyers praise and complain about, mined from review topics.What buyers love
“Seems well made”
“Easy fit”
“Just what I needed”
“Excellent price”
“Completely waterproof”
“its not noisy or anything like that”
“Nice and soft material”
“So comfortable”
“Easy to wash”
“Best Mattress Protector”
What buyers complain about
“Not water proof”
“it was far too small”
“the quality control just isn't there”
“Made a noise when moving around in bed”
“Its not 100% cotton”
“uncomfortable”
“Quite a thin item”
“Good although quite thin”
“Grippy texture”
“Not sure how absorbent they would be for large amount”
Top return reasons
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.