---
title: "Trend — king size extra deep 18-24 pocket waterproof mattress protector - Flapen"
canonical_url: "https://flapen.com/research/us/home-kitchen/king-size-extra-deep-18-24-pocket-waterproof-mattress-protector/trend"
last_updated: "2026-08-11T12:16:58.578Z"
locale: en
meta:
  description: "Niche score 50/100 · $139K/yr market · 39K searches/yr. A deep review moat (48,159 avg reviews) keeps it on the watch list. Data updated Jul 2026."
  "og:description": "Niche score 50/100 · $139K/yr market · 39K searches/yr. A deep review moat (48,159 avg reviews) keeps it on the watch list. Data updated Jul 2026."
  "og:title": "Trend — king size extra deep 18-24 pocket waterproof mattress protector - Flapen"
---

# **king size extra deep 18-24 pocket waterproof mattress protector**

**Worth a look**

Shows a sweet-spot price point ($35.85 avg), but a deep review moat (48,159 avg reviews) keeps it on the watch list.

Market size 31Growth 20Conversion 87Competition 51Returns 75Price range 95Avg price 95Brand share 61Review moat 1Quality gap 33

**Avg price**

**Incredible****$35.85**

avg listing price — sweet spot $15–$100

**Price range**

**Incredible****$16.39–$59.75**

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

**Conversion**

**Great****10.0%**

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

**Returns**

**Good****2.0%**

return rate — above 5% kills the launch gate

**Brand share**

**Good****68%**

top-5 brand share — brands hold most of the demand

**Competition**

**Good****55%**

top-5 click share — leaders hold, buyers still browse

**Quality gap**

**Okay****4.5★**

avg incumbent rating — lower means beatable quality

**Market size**

**Okay****$139K**

$139K/yr · 39K searches

**Growth**

**Bad****-10.3%**

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

**Review moat**

**Bad****48,159.17**

avg incumbent reviews — the moat a new listing must climb

## Trend