---
product_id: 43084568
title: "Mattress Helper MINI Under Mattress Support Extender- Fix Your Sagging Mattress Firmer Solution for Mattresses - Mini Extender"
brand: "mattress helper"
price: "€ 99.79"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.pt/products/43084568-mattress-helper-mini-under-mattress-support-extender-fix-your-sagging
store_origin: PT
region: Portugal
---

# 31-inch extender length Lightweight 2 lbs for easy handling Designed for California King mattresses Mattress Helper MINI Under Mattress Support Extender- Fix Your Sagging Mattress Firmer Solution for Mattresses - Mini Extender

**Brand:** mattress helper
**Price:** € 99.79
**Availability:** ✅ In Stock

## Summary

> 🛏️ Upgrade your sleep game—because sagging mattresses are so last season!

## Quick Answers

- **What is this?** Mattress Helper MINI Under Mattress Support Extender- Fix Your Sagging Mattress Firmer Solution for Mattresses - Mini Extender by mattress helper
- **How much does it cost?** € 99.79 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/43084568-mattress-helper-mini-under-mattress-support-extender-fix-your-sagging)

## Best For

- mattress helper enthusiasts

## Why This Product

- Trusted mattress helper brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Contoured Comfort:** Firm yet gentle support that’s undetectable under your mattress—no hard spots, just smooth rest.
- • **Tailored for California King:** Specifically engineered as a perfect add-on for California King beds, ensuring seamless fit and stability.
- • **Extend Your Mattress Lifespan:** Add 18 extra inches of firm support to sagging mattresses without a full replacement.
- • **Cost-Effective Mattress Rescue:** Save hundreds by reinforcing your mattress instead of buying new—smart, sustainable sleep upgrade.
- • **Easy Installation & Versatility:** Lightweight and compact design fits under mattresses or couches—measure first for perfect support.

## Overview

The Mattress Helper MINI is an 18-inch long under-mattress support extender designed exclusively as an add-on for California King mattresses. Lightweight at just 2 pounds and contoured for comfort, it reinforces sagging areas without the need for a full mattress replacement. Ideal for platform beds and couches (with proper measurement), it offers a cost-effective, easy-to-install solution to extend mattress life and maintain firm, comfortable support.

## Description

Buy Mattress Helper MINI Under Mattress Support Extender- Fix Your Sagging Mattress Firmer Solution for Mattresses - Mini Extender: Bedroom Furniture - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Great product that works! - Great product! I have a slightly beginning to sag mattress on a platform frame. Unfortunately the sag falls in a spot on the frame that is open. I tried plywood but it was too hard. This product was not only a great price, it works! It is firm but not hard. Contoured so you cannot feel it. I am cery pleased and am going to buy another for our guest room.
Review: Cal King instructions - California King Instructions: Buy the 1 x King set which includes two pads. Then buy 2 x "Mini 31" pad which completes the length of the mattress. You will need TWO Mini 31s to do this. We caught a better price at Target online for the King set and then bought the Mini 31s through desertcart. We could not find the Mini 31s offered anywhere else. Total cost for everything was (King $100 + 2 x Mini 31 $60) = $160. The set itself seems to be working well. We are using this in conjunction with a Stearns & Foster pillowtop that is sagging. It seems to be helping for the most part; it is a "helper" but not entirely perfect for fixing the sag on each side. However, this beats buying a new mattress for the problem. It seems like a waste to keep buying more mattresses because of sag.

## Features

- DESIGNED *ONLY* AS AN ADD-ON for EXTRA LENGTH to regular Mattress Helper
- ONLY use for California King mattresses or as needed for EXTRA LENGTH - ONLY 18" INCHES LONG
- NOT TO BE USED WITHOUT regular MATTRESS HELPER
- Can be used for Couch support BUT MEASURE FIRST
- ONLY 18" INCHES LONG

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00UB5YQRW |
| Age Range Description | Adult |
| Assembled Height | 2 inches |
| Assembled Length | 31 inches |
| Assembled Width | 18 inches |
| Customer Reviews | 3.9 3.9 out of 5 stars (135) |
| Date First Available | March 5, 2015 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1.87 pounds |
| Item model number | COMIN16JU018348 |
| Product Dimensions | 18 x 31 x 2 inches |
| Weight | 2 Pounds |

## Product Details

- **Brand:** Mattress Helper
- **Color:** Beige
- **Construction Type:** Memory Foam
- **Cover Material:** polyurethane
- **Fill Material:** Memory Foam
- **Item Firmness Description:** Firm
- **Size:** King
- **Special Feature:** Durable, Orthopedic
- **Top Style:** Tight Top
- **UPC:** 851466005043

## Images

![Mattress Helper MINI Under Mattress Support Extender- Fix Your Sagging Mattress Firmer Solution for Mattresses - Mini Extender - Image 1](https://m.media-amazon.com/images/I/817WW53DUnL.jpg)
![Mattress Helper MINI Under Mattress Support Extender- Fix Your Sagging Mattress Firmer Solution for Mattresses - Mini Extender - Image 2](https://m.media-amazon.com/images/I/91G3rERhS-L.jpg)
![Mattress Helper MINI Under Mattress Support Extender- Fix Your Sagging Mattress Firmer Solution for Mattresses - Mini Extender - Image 3](https://m.media-amazon.com/images/I/81HHh3h3bSL.jpg)
![Mattress Helper MINI Under Mattress Support Extender- Fix Your Sagging Mattress Firmer Solution for Mattresses - Mini Extender - Image 4](https://m.media-amazon.com/images/I/715ltw0ew0L.jpg)
![Mattress Helper MINI Under Mattress Support Extender- Fix Your Sagging Mattress Firmer Solution for Mattresses - Mini Extender - Image 5](https://m.media-amazon.com/images/I/81PJUF--eGL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great product that works!
*by E***. on September 13, 2018*

Great product! I have a slightly beginning to sag mattress on a platform frame. Unfortunately the sag falls in a spot on the frame that is open. I tried plywood but it was too hard. This product was not only a great price, it works! It is firm but not hard. Contoured so you cannot feel it. I am cery pleased and am going to buy another for our guest room.

### ⭐⭐⭐⭐ Cal King instructions
*by A***R on April 20, 2017*

California King Instructions: Buy the 1 x King set which includes two pads. Then buy 2 x "Mini 31" pad which completes the length of the mattress. You will need TWO Mini 31s to do this. We caught a better price at Target online for the King set and then bought the Mini 31s through Amazon. We could not find the Mini 31s offered anywhere else. Total cost for everything was (King $100 + 2 x Mini 31 $60) = $160. The set itself seems to be working well. We are using this in conjunction with a Stearns & Foster pillowtop that is sagging. It seems to be helping for the most part; it is a "helper" but not entirely perfect for fixing the sag on each side. However, this beats buying a new mattress for the problem. It seems like a waste to keep buying more mattresses because of sag.

### ⭐⭐⭐⭐⭐ It actually works.
*by V***Y on May 21, 2021*

Inhad my doubts. My matress started to develop a sink hole in it after only 2 months of having it. I went online to see what I could since I could not afford a new matress. I got this and it actually works wonders. My matress is firm now and the sink hole is gone.

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**Shop now:** [https://www.desertcart.pt/products/43084568-mattress-helper-mini-under-mattress-support-extender-fix-your-sagging](https://www.desertcart.pt/products/43084568-mattress-helper-mini-under-mattress-support-extender-fix-your-sagging)

---

*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-04-23*