Is waterproof cast cover arm child profitable to sell on Amazon United States?

The niche generates $49K/yr across 8 tracked products. 90-day search growth is +149.2%. Flapen's verdict: Skip it (41/100).

How competitive is the waterproof cast cover arm child niche?

2 brands and 6 sellers compete. The top 5 products take 90% of clicks and top 5 brands hold 100% of demand.

What do buyers complain about in waterproof cast cover arm child?

Top complaints mined from reviews: Size-Overall, Water Resistance, Durability. The return rate is 9.3% — above our launch gate.

When does demand for waterproof cast cover arm child peak?

Demand peaks in May–Jun–Jul–Aug; the busiest month runs 6.3× the quietest.

What does it cost to enter the waterproof cast cover arm child niche?

Listings span $9.97–$35.82; the average listing price is $31.86 (sweet spot $15–$100). The average incumbent carries 9,494 reviews — the moat a new listing must climb.

waterproof cast cover arm child

Skip it

Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.

Growth

Incredible+149.2%

90-day search growth — must beat 0% to launch

Avg price

Incredible$31.86

avg listing price — sweet spot $15–$100

Price range

Great$9.97–$35.82

cheapest to priciest tracked listing — scored on the share inside $15–$100

Conversion

Good6.1%

search→purchase rate — share of searches ending in a sale

Quality gap

Good4.4★

avg incumbent rating — lower means beatable quality

Review moat

Bad9,494

avg incumbent reviews — the moat a new listing must climb

Market size

Bad$49K

$49K/yr · 25K searches

Returns

Bad9.3%

return rate — above 5% kills the launch gate

Competition

Bad90%

top-5 click share — a locked-up shelf

Brand share

Bad100%

top-5 brand share — brand-locked demand

Signals Trending High Returns

According to Flapen's Amazon United States niche tracking, waterproof cast cover arm child is a $49K/yr Amazon United States market (25K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in May–Jun–Jul–Aug. Verdict: Skip it — 41/100.

Data updated Jul 14, 2026 · scored weekly · How we score niches

waterproof cast cover arm child market data

Units sold / yr: 2K–2K; avg 100–250/product
Revenue / yr: $48K–$64K; units × avg price
Conversion rate: 6.1%
Avg BSR: #344
Page quality: 0%
Prime: 100%
Sponsored: 100%
Out of stock: 0.6%
Avg brand age: 54 months
Avg seller age: 155 days

Competition & brand share

The top 5 products capture 90% of clicks — a locked-up shelf that new listings rarely crack.

Brands

2 falling

Sellers

Top-5 brand share

100%

Top 20: 100%

Top-5 click share

90%

Top 20: 100%

Open market

BLOCCS91%
Mighty-X9%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +149.2% search growth over the last 90 days.

Peak months: May, Jun, Jul, Aug · busiest ÷ quietest = 6.3×

Open Trend

Top waterproof cast cover arm child search terms

bloccs waterproof cast cover for kids12K/yr +163.5%7.4% conv.
drypro waterproof cast cover arm5K/yr +138.7%2.1% conv.
dry pro waterproof cast cover arm5K/yr +119.0%2.8% conv.
bloccs4K/yr +152.7%2.5% conv.

All search terms

Top waterproof cast cover arm child 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.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 8 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

BLOCCS 100% Waterproof Cast Covers for Shower Arm Kids- Swim Cover Cast Bag for Bath. Durable Cast Sleeve for Swimming - #CA79-M - Child Arm (Medium)

BLOCCS$34.934.5★5,769 rev

BLOCCS 100% Waterproof Cast Covers for Shower Arm Kids- Swim Cover Cast Bag for Bath. Durable Cast Sleeve for Swimming - #CA79-L - Child Arm (Large)

BLOCCS$34.734.5★4,177 rev

BLOCCS 100% Waterproof Cast Covers for Shower Arm Kids- Swim Cover Cast Bag for Bath. Durable Cast Sleeve for Swimming - #CA79-S - Child Arm (Small)

BLOCCS$34.574.6★2,824 rev

100% Waterproof Cast Covers for Shower Arm - Tight Seal - 3pk Adult Reusable Cast Protectors - Half Arm Bag Sleeves

Mighty-X$9.974.4★46,385 rev

BLOCCS 100% Waterproof Cast Covers for Shower Leg Kids- Swim Cover Cast Bag for Bath. Durable Cast Sleeve for Swimming - #CL78-M - Child Leg - (Medium)

BLOCCS$35.304.3★3,161 rev

Newest

by launch date

100% Waterproof Cast Covers for Shower Arm - Tight Seal - 3pk Adult Reusable Cast Protectors - Half Arm Bag Sleeves

Mighty-X$9.9746,385 rev

8y ago

BLOCCS 100% Waterproof Cast Covers for Shower Arm Kids- Swim Cover Cast Bag for Bath. Durable Cast Sleeve for Swimming - #CA79-M - Child Arm (Medium)

BLOCCS$34.935,769 rev

12y ago

BLOCCS 100% Waterproof Cast Covers for Shower Arm - Swim Cover Cast Bag for Bath. Durable Cast Sleeve for Swimming - #ASA70 - Adult Short Arm

BLOCCS$34.907,314 rev

12y ago

BLOCCS 100% Waterproof Cast Covers for Shower Leg Kids- Swim Cover Cast Bag for Bath. Durable Cast Sleeve for Swimming - #CL78-M - Child Leg - (Medium)

BLOCCS$35.303,161 rev

13y ago

BLOCCS 100% Waterproof Cast Covers for Shower Arm Kids- Swim Cover Cast Bag for Bath. Durable Cast Sleeve for Swimming - #CA79-L - Child Arm (Large)

BLOCCS$34.734,177 rev

13y ago

What buyers say about waterproof cast cover arm child

What buyers praise and complain about, mined from review topics.

What buyers love

Water Resistance14%

“COMPLETELY water proof”

Efficiency11%

“Does it work”

Quality-Overall11%

“Excellent product”

Ease Of Use9%

“Easy to use”

Leak-Proof8%

“Did not leak”

Advertised Vs Actual Product7%

“As advertised”

Value For Money7%

“Great value”

Size-Overall6%

“easy to fit on”

Moist/Dry5%

“Perfect dryness”

Durability4%

“Its very durable”

What buyers complain about

Size-Overall13%

“he's a little bit bigger”

Water Resistance12%

“Not Water-Proof”

Durability7%

“Not durable”

Ease Of Use7%

“Difficult to use”

Thickness4%

“Had my doubts as seemed thin”

Quality-Overall4%

“terrible product”

Functionality-Overall4%

“These cast covers really did not work for me”

Leak-Proof3%

“Leaks”

Moist/Dry3%

“cast was completely dry when we pulled the cast cover off”

Value For Money3%

“Way to expensive for so little uses”

Top return reasons

Size-Overall67%

Advertised Vs Actual Product6%

Water Resistance5%

Material Quality4%

Leak-Proof3%

Functionality-Overall3%

Product Condition1%

Durability1%

Ease Of Use1%

Age Suitability1%

Common questions

Is waterproof cast cover arm child profitable to sell on Amazon United States?: The niche generates $49K/yr across 8 tracked products. 90-day search growth is +149.2%. Flapen's verdict: Skip it (41/100).
How competitive is the waterproof cast cover arm child niche?: 2 brands and 6 sellers compete. The top 5 products take 90% of clicks and top 5 brands hold 100% of demand.
What do buyers complain about in waterproof cast cover arm child?: Top complaints mined from reviews: Size-Overall, Water Resistance, Durability. The return rate is 9.3% — above our launch gate.
When does demand for waterproof cast cover arm child peak?: Demand peaks in May–Jun–Jul–Aug; the busiest month runs 6.3× the quietest.
What does it cost to enter the waterproof cast cover arm child niche?: Listings span $9.97–$35.82; the average listing price is $31.86 (sweet spot $15–$100). The average incumbent carries 9,494 reviews — the moat a new listing must climb.