---
title: "barnacle boy costume — Niche Verdict: Skip it (35/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/clothing-shoes-jewelry/barnacle-boy-costume"
last_updated: "2026-07-14T04:29:18.803Z"
locale: en
meta:
  description: "high returns (9.9%) — barnacle boy costume doesn't clear our bar today."
  "og:description": "high returns (9.9%) — barnacle boy costume doesn't clear our bar today."
  "og:title": "barnacle boy costume — Niche Verdict: Skip it (35/100) | Amazon United States - Flapen"
---

Back to Flapen home

# **barnacle boy costume**

**Skip it**

High returns (9.9%) — this niche doesn't clear our bar today.

Market size 10Growth 32Conversion 23Competition 15Returns 9Price range 79Avg price 95Brand share 17Review moat 97Quality gap 81

**Review moat**

**Incredible****55.5**

avg incumbent reviews — the moat a new listing must climb

**Avg price**

**Incredible****$25.36**

avg listing price — sweet spot $15–$100

**Quality gap**

**Great****4.2★**

avg incumbent rating — lower means beatable quality

**Price range**

**Great****$6.85–$48.66**

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

**Growth**

**Okay****+5.6%**

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

**Conversion**

**Bad****1.8%**

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

**Brand share**

**Bad****93%**

top-5 brand share — brand-locked demand

**Competition**

**Bad****82%**

top-5 click share — a locked-up shelf

**Market size**

**Bad****$41K**

$41K/yr · 88K searches

**Returns**

**Bad****9.9%**

return rate — above 6% kills the launch gate

## **Competition**

The top 5 products capture 82% of clicks — a locked-up shelf that new listings rarely crack.

**Brands**

**7 **▼falling

**Sellers**

**8**

**Top-5 brand share**

**93%**

**Open market**

**3%**

- Matiniy61% - EchoElce11% - Spirit Halloween8% - JQAKFIY7% - Bgfhna5% - Aniler4% - Open — no brand owns it (1 brand, 3%)

## **Product shelf**

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

0%15%$6K30%$12K45%$18K60%$25K1101001K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

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

All 10 tracked products in this niche — three views at once, no toggling.

### **Top sellers**

by 90-day click share

[1![Matiniy Halloween Cosplay Accessories Set Include Red Long Sleeves White Hat Blue Gloves Scarf Gloves Black Glasses (L)](https://m.media-amazon.com/images/I/41QBD8IqLCL.jpg)**Matiniy Halloween Cosplay Accessories Set Include Red Long Sleeves White Hat Blue Gloves Scarf Gloves Black Glasses (L)**Matiniy**$23.99**4.2★16 rev](https://www.amazon.com/dp/B0D8132ZK9) [2![EchoElce 5 PCS Halloween Sailor Costume Accessories Include Sailor Hat Blue Scarf Gloves Socks Eye Mask for Women Men Halloween Party Cosplay](https://m.media-amazon.com/images/I/41sYjGkMnnL.jpg)**EchoElce 5 PCS Halloween Sailor Costume Accessories Include Sailor Hat Blue Scarf Gloves Socks Eye Mask for Women Men Halloween Party Cosplay**EchoElce**$19.41**3.9★17 rev](https://www.amazon.com/dp/B0DCBSZHT2) [3![Spirit Halloween Adult Spongebob Squarepants Barnacle Boy Costume](https://m.media-amazon.com/images/I/41baXDZ52lL.jpg)**Spirit Halloween Adult Spongebob Squarepants Barnacle Boy Costume**Spirit Halloween**$48.66**4.3★100 rev](https://www.amazon.com/dp/B08CLXNTCZ) [4![5 PCS Halloween Sailor Costume Include Sailor Hat Scarf Gloves Socks Glasses for Men Women Cartoon Character Dress Up (Medium) Bluewhite](https://m.media-amazon.com/images/I/41YFqMGF1OL.jpg)**5 PCS Halloween Sailor Costume Include Sailor Hat Scarf Gloves Socks Glasses for Men Women Cartoon Character Dress Up (Medium) Bluewhite**Matiniy**$18.68**4.4★78 rev](https://www.amazon.com/dp/B0CD1QKYK1) [5![Bgfhna 5 PCS Halloween Sailor Costume Sailor Hat Scarf Gloves Blue Athletic Compression Socks Glasses for Men Women Dress Up](https://m.media-amazon.com/images/I/41nLWDGF81L.jpg)**Bgfhna 5 PCS Halloween Sailor Costume Sailor Hat Scarf Gloves Blue Athletic Compression Socks Glasses for Men Women Dress Up**Bgfhna**$15.68**4.5★4 rev](https://www.amazon.com/dp/B0FF433D6S)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![Bgfhna 5 PCS Halloween Sailor Costume Sailor Hat Scarf Gloves Blue Athletic Compression Socks Glasses for Men Women Dress Up](https://m.media-amazon.com/images/I/41nLWDGF81L.jpg)**Bgfhna 5 PCS Halloween Sailor Costume Sailor Hat Scarf Gloves Blue Athletic Compression Socks Glasses for Men Women Dress Up**Bgfhna**$15.68**4 rev1y ago](https://www.amazon.com/dp/B0FF433D6S) [![JQAKFIY Barnacle Boy Costume Mermaid Men Costumes Adult Halloween Character Cosplay Outfit Set with Hat Gloves Scarf Prop M](https://m.media-amazon.com/images/I/41T5B+E4XML.jpg)**JQAKFIY Barnacle Boy Costume Mermaid Men Costumes Adult Halloween Character Cosplay Outfit Set with Hat Gloves Scarf Prop M**JQAKFIY**$45.93**6 rev1y ago](https://www.amazon.com/dp/B0FBGP1G4S) [![JQAKFIY Barnacle Boy Costume Mermaid Men Costumes Adult Halloween Character Cosplay Outfit Set with Hat Gloves Scarf Prop XL](https://m.media-amazon.com/images/I/41T5B+E4XML.jpg)**JQAKFIY Barnacle Boy Costume Mermaid Men Costumes Adult Halloween Character Cosplay Outfit Set with Hat Gloves Scarf Prop XL**JQAKFIY**$46.04**6 rev1y ago](https://www.amazon.com/dp/B0FBGNXFGP) [![EchoElce 5 PCS Halloween Sailor Costume Accessories Include Sailor Hat Blue Scarf Gloves Socks Eye Mask for Women Men Halloween Party Cosplay](https://m.media-amazon.com/images/I/41sYjGkMnnL.jpg)**EchoElce 5 PCS Halloween Sailor Costume Accessories Include Sailor Hat Blue Scarf Gloves Socks Eye Mask for Women Men Halloween Party Cosplay**EchoElce**$19.41**17 rev1y ago](https://www.amazon.com/dp/B0DCBSZHT2) [![Matiniy Halloween Cosplay Accessories Set Include Red Long Sleeves White Hat Blue Gloves Scarf Gloves Black Glasses (L)](https://m.media-amazon.com/images/I/41QBD8IqLCL.jpg)**Matiniy Halloween Cosplay Accessories Set Include Red Long Sleeves White Hat Blue Gloves Scarf Gloves Black Glasses (L)**Matiniy**$23.99**16 rev2y ago](https://www.amazon.com/dp/B0D8132ZK9)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![Matiniy Halloween Cosplay Accessories Set Include Red Long Sleeves White Hat Blue Gloves Scarf Gloves Black Glasses (L)](https://m.media-amazon.com/images/I/41QBD8IqLCL.jpg)**Matiniy Halloween Cosplay Accessories Set Include Red Long Sleeves White Hat Blue Gloves Scarf Gloves Black Glasses (L)**Matiniy**$23.99**4.2★**▲ 623%**](https://www.amazon.com/dp/B0D8132ZK9) [![Aniler Unisex 18 Elbow Length Full Finger Costume Party Stretchy Gloves (One Size Navy Blue)](https://m.media-amazon.com/images/I/41kl4zcLSbL.jpg)**Aniler Unisex 18 Elbow Length Full Finger Costume Party Stretchy Gloves (One Size Navy Blue)**Aniler**$9.69**4.4★**▲ 492%**](https://www.amazon.com/dp/B09Y35Y8HJ) [![JQAKFIY Barnacle Boy Costume Mermaid Men Costumes Adult Halloween Character Cosplay Outfit Set with Hat Gloves Scarf Prop M](https://m.media-amazon.com/images/I/41T5B+E4XML.jpg)**JQAKFIY Barnacle Boy Costume Mermaid Men Costumes Adult Halloween Character Cosplay Outfit Set with Hat Gloves Scarf Prop M**JQAKFIY**$45.93**4.1★**▲ 391%**](https://www.amazon.com/dp/B0FBGP1G4S) [![JQAKFIY Barnacle Boy Costume Mermaid Men Costumes Adult Halloween Character Cosplay Outfit Set with Hat Gloves Scarf Prop XL](https://m.media-amazon.com/images/I/41T5B+E4XML.jpg)**JQAKFIY Barnacle Boy Costume Mermaid Men Costumes Adult Halloween Character Cosplay Outfit Set with Hat Gloves Scarf Prop XL**JQAKFIY**$46.04**4.1★**▲ 126%**](https://www.amazon.com/dp/B0FBGNXFGP) [![Matiniy 5 PCS Halloween Sailor Costume Include Sailor Hat Scarf Gloves Socks Glasses for Men Women Cartoon Character Dress Up (Large)](https://m.media-amazon.com/images/I/41YFqMGF1OL.jpg)**Matiniy 5 PCS Halloween Sailor Costume Include Sailor Hat Scarf Gloves Socks Glasses for Men Women Cartoon Character Dress Up (Large)**Matiniy**$18.67**4.4★**▲ 103%**](https://www.amazon.com/dp/B0CD1RN2P6)

**~~View all trending →~~**

## **Demand & seasonality**

Weekly Amazon search volume, last 104 weeks — +5.6% search growth over the last 90 days.

20K15KSpike '24Spike '25Prime Day '25 seasonSepDecMarJunAugNovMarMay

Peak months: Oct, Nov · busiest ÷ quietest = 41.5×

## **Reviews**

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

### **What buyers love **

**Quality-Overall**33%

*“Good quality”*

### **What buyers complain about **

**Size-Overall**67%

*“Definitely runs tight”*

**Allergies**17%

*“The hat is a little itchy”*

### **Top return reasons **

**Size-Overall**55%

**Waist Fit**6%

**Value For Money**6%

**Product Condition**6%

**Quality-Overall**6%

**Length**3%

**Material Quality**3%

**Gap/Hole**3%

**Smell**3%

**Stretchability/Expandability/Elasticity**3%