california king mattress protector
Worth a lookShows a sweet-spot price point ($30.99 avg), but a deep review moat (63,147 avg reviews) keeps it on the watch list.
Avg price
Incredible$30.99avg listing price — sweet spot $15–$100
Price range
Incredible$18.99–$54.30cheapest to priciest tracked listing — scored on the share inside $15–$100
Conversion
Great10.0%search→purchase rate — share of searches ending in a sale
Market size
Great$1.4M$1.4M/yr · 459K searches
Returns
Great1.7%return rate — above 5% kills the launch gate
Competition
Okay66%top-5 click share — leaders hold, buyers still browse
Growth
Okay+3.1%90-day search growth — must beat 0% to launch
Quality gap
Okay4.6★avg incumbent rating — lower means beatable quality
Brand share
Bad91%top-5 brand share — brand-locked demand
Review moat
Bad63,147.06avg incumbent reviews — the moat a new listing must climb
According to Flapen's Amazon United States niche tracking, california king mattress protector is a $1.4M/yr Amazon United States market (459K searches/yr). The top 5 brands hold 91% of demand. Verdict: Worth a look — 53/100.
Data updated Jul 29, 2026 · scored weekly · How we score niches
california king mattress protector market data
- Units sold / yr
- 50K–60K
- avg 4,000–5,000/product
- Revenue / yr
- $1.5M–$1.9M
- units × avg price
- Conversion rate
- 10.0%
- Avg BSR
- #13
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 94%
- Out of stock
- 0.0%
- Avg brand age
- 58 months
- Avg seller age
- 170 days
Competition & brand share
The top 5 products take 66% of clicks — established leaders, but buyers still shop beyond them.Brands
8 falling
Sellers
16
Top-5 brand share
91%
Top 20: 100%
Top-5 click share
66%
Top 20: 100%
Open market
5%
- BEDLORE41%
- Utopia Bedding29%
- SafeRest8%
- GRT7%
- GOPOONY7%
- MUXHOMO4%
- Open — no brand owns it (2 brands, 5%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +3.1% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.1×
Top california king mattress protector search terms
- california king mattress protector148K/yr
- cal king mattress protector86K/yr
- california king mattress cover42K/yr
- mattress protector california king28K/yr
- cali king mattress protector19K/yr
- cal king mattress cover18K/yr
- california king waterproof mattress protector18K/yr
- cal king waterproof mattress protector14K/yr
- waterproof mattress protector california king10K/yr
- mattress protector cal king8K/yr
Top california king 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 16 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
BEDLORE Waterproof Mattress Protector California King Size Mattress Pad with Deep Pocket 6-18 Depth Soft Noiseless Dirt-Proof Bed Mattress Cover Washable for Home Bedroom Hotel (Gray)
BEDLORE$29.504.6★23,362 rev
California King Size Mattress Protector Waterproof Premium 200 GSM Terry Mattress Cover Soft & Breathable Bed Cover Fitted Sheet Style Stretchable Deep Pockets 17 by Utopia Bedding (White)
Utopia Bedding$20.184.5★104,639 rev
SafeRest Waterproof California King Size Mattress Protector - Fitted with Stretchable Pockets - Machine Washable Cotton Blend Mattress Cover for Bed
SafeRest$44.984.6★280,383 rev
GRT Waterproof California King Mattress Protector Rayon Bamboo - 3D Air Fiber Cooling Mattress Cover Breathable Ultra Soft Mattress Pad Noiseless Fits up to 26 Deep Pocket Machine Washable
GRT$32.994.6★1,845 rev
Premium Waterproof Mattress Protector California King Size Breathable Bed Cover 3D Air Fabric Cooling Mattress Pad Cover Smooth Soft Noiseless Washable 8-21 Deep Pocket (White)
GOPOONY$36.334.6★17,468 rev
Newest
by launch date
Utopia Bedding Waterproof Mattress Protector California King Size Premium 3D Air Soft Fabric Mattress Cover Fits 17 Inches Deep Breathable Fitted Style with Stretchable Pockets
Utopia Bedding$18.991,903 rev
BEDLORE California King Mattress Protector Waterproof Noiseless Mattress Cover with Deep Pocket for 6-18 inches Mattress Soft Breathable Mattress Pad Machine Washable (Dark Gray)
BEDLORE$30.163,975 rev
MUXHOMO California King Mattress Protector 100% Waterproof Mattress Cover Cal King Size Bed Cooling and Breathable Bed Pad Cover Deep Pocket 8-21
MUXHOMO$20.468,799 rev
BEDLORE Waterproof Mattress Protector Noiseless California King Size Mattress Pad with Deep Pocket Fitted Up to 6-18 inches Soft Breathable Dirt-Proof Bed Mattress Cover for Bedroom(Gray)
BEDLORE$29.309,429 rev
BEDLORE Waterproof Mattress Protector California King Size Mattress Pad with Deep Pocket 6-18 Depth Soft Noiseless Dirt-Proof Bed Mattress Cover Washable for Home Bedroom Hotel (Gray)
BEDLORE$29.5023,362 rev
Trending
90-day click momentumUtopia Bedding Waterproof Mattress Protector California King Size Premium 3D Air Soft Fabric Mattress Cover Fits 17 Inches Deep Breathable Fitted Style with Stretchable Pockets
Utopia Bedding$18.994.6★
BEDLORE Waterproof Mattress Protector California King Size Noiseless Mattress Pad with Deep Pocket 6-18 Depth Soft Breathable Bed Mattress Cover Washable for Home Bedroom Hotel (White)
BEDLORE$29.744.6★
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$27.464.6★
BEDLORE California King Mattress Protector Waterproof Noiseless Mattress Cover with Deep Pocket for 6-18 inches Mattress Soft Breathable Mattress Pad Machine Washable (Dark Gray)
BEDLORE$30.164.7★
GRT Waterproof California King Mattress Protector Rayon Bamboo - 3D Air Fiber Cooling Mattress Cover Breathable Ultra Soft Mattress Pad Noiseless Fits up to 26 Deep Pocket Machine Washable
GRT$32.994.6★
What buyers say about california king mattress protector
What buyers praise and complain about, mined from review topics.What buyers love
“Excellent fit”
“Excellent product”
“Definitely Waterproof”
“Soft and comfortable”
“Great value”
“stays perfectly smooth”
“comfortable mattress pad”
“As advertised”
“Perfect for my thick mattress”
“I love the color”
What buyers complain about
“NOT WATERPROOF”
“it leaked”
“Too big”
“Absolute trash”
“Did not work”
“Not as advertised”
“Its rather thin material”
“Not noiseless”
“then tumbled dry”
“Creates too much heat”
Top return reasons
Common questions
- Is california king mattress protector profitable to sell on Amazon United States?
- The niche generates $1.4M/yr across 16 tracked products. 90-day search growth is +3.1%. Flapen's verdict: Worth a look (53/100).
- How competitive is the california king mattress protector niche?
- 8 brands and 16 sellers compete. The top 5 products take 66% of clicks and top 5 brands hold 91% of demand.
- What do buyers complain about in california king mattress protector?
- Top complaints mined from reviews: Water Resistance, Leak-Proof, Size-Overall. The return rate is 1.7%.
- When does demand for california king mattress protector peak?
- Demand is steady year-round — the busiest month runs 1.1× the quietest.
- What does it cost to enter the california king mattress protector niche?
- Listings span $18.99–$54.30; the average listing price is $30.99 (sweet spot $15–$100). The average incumbent carries 63,147 reviews — the moat a new listing must climb.