---
product_id: 49870985
title: "Posture Wedge Seat Cushion | Very Hard No Flex Cushion for Posture Correction | Pelvic Stability | Car | Chair seat for Office | Meditation (Hard 2.5 in)"
brand: "sitts"
price: "¥22555"
currency: JPY
in_stock: true
reviews_count: 6
url: https://www.desertcart.jp/products/49870985-posture-wedge-seat-cushion-very-hard-no-flex-cushion-posture
store_origin: JP
region: Japan
---

# liquid & odor resistant portable for car & travel 2.5 in ultra-firm support Posture Wedge Seat Cushion | Very Hard No Flex Cushion for Posture Correction | Pelvic Stability | Car | Chair seat for Office | Meditation (Hard 2.5 in)

**Brand:** sitts
**Price:** ¥22555
**Availability:** ✅ In Stock

## Summary

> 🪑 Sit Firm, Stand Tall: The Ultimate Posture Powerhouse

## Quick Answers

- **What is this?** Posture Wedge Seat Cushion | Very Hard No Flex Cushion for Posture Correction | Pelvic Stability | Car | Chair seat for Office | Meditation (Hard 2.5 in) by sitts
- **How much does it cost?** ¥22555 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/49870985-posture-wedge-seat-cushion-very-hard-no-flex-cushion-posture)

## Best For

- sitts enthusiasts

## Why This Product

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

## Key Features

- • **Inclusive Ergonomics:** Engineered for all body types and ages, delivering professional-grade posture correction wherever you sit.
- • **Durable & Hygienic Design:** Waterproof, odor-resistant skin-over-foam technology ensures long-lasting freshness and easy cleaning.
- • **Medical-Grade Pain Relief:** Designed to alleviate sciatica, tailbone, and lower back pain with targeted, steady support.
- • **Versatile Anywhere Comfort:** Compact and travel-ready—perfect for office chairs, cars, meditation, gaming, and even wheelchairs.
- • **Unmatched Stability for Posture:** Very firm 2.5-inch cushion locks your pelvis in perfect alignment, eliminating unwanted movement.

## Overview

The SITTS Posture Wedge Seat Cushion offers a very firm 2.5-inch support layer designed to stabilize your pelvis and correct posture. Ideal for those needing medical-grade firmness to relieve severe tailbone, sciatica, and lower back pain, it features a waterproof, odor-resistant surface for durability and hygiene. Portable and versatile, it’s perfect for office, car, meditation, and travel use, catering to all body types seeking unparalleled spinal alignment and comfort.

## Description

SITTS offers wedge seat cushion to those that want the cushion very firm. The size of the cushion is 2.5 inch wedge x 15 inch width x 14 inch long. The tilted wedge and cutout design helps alleviate the toughest back pain while using active balance technology. The angle design relaxes glute muscles, relieving pressure and strain on the tailbone and sitz bone, while improving circulation to the legs and lower back. While this variation is very firm, there is other in our selection that will allow long sitting with a medium firm buoyancy that never flattens out with use. Use in the car or office and in most couches.

## Features

- SITTS FIRM GIVES YOU SUPPORT and if your looking for medium firm this cushion, check out other offers by SITTS. Firm to very firm, depends on your weight. Very firm cushion can help with very unique circumstances where a person needs no movement or stable support. Not recommended for most due to the firmness.
- COCCYX SEAT CUSHION FOR TAILBONE PAIN: A Very Firm steady support may feel hard, but in some chairs that are soft you sink, SITTS will prevent that.. Medium Firm is more comfortable. Some need steady instant relief from poor posture and back pain. Use our seat cushion if you suffer from Sciatica, nerve pain, lower back pain, hip injuries, unparalleled relief for even the most severe pain.
- CUSHIONED WITH THE RIGHT AMOUNT OF SUPPORT: Our premium cushion is designed with a firmer feel to relieve pain through the right amount of support and still give you some cushioning. Unlike other seat cushions that don't give your spine the right amount of support for effective relief, ours provides you with a medical grade style of firmness others just can't deliver. The SITTS cushion is designed for all ages, body types, and genders.
- EASY CLEAN, LIQUID & ODOR RESISTANT: SITTS skin over foam molding process encloses the highly resilient foam with a flexible soft barrier, repellant to water, resulting in many years of use.
- PORTABLE & TRAVEL FRIENDLY: No more back pain no matter where you go. The SITTS cushion is perfect to use on the floor or seat. Use it as a meditation cushion pillow, gaming pillow, and extra cushioning for rocking chairs, hard surfaces, and wheelchairs. It's designed to travel with you wherever you go. Use it in the home, car, RV, work, airplanes, sporting events, movies, concerts, and everywhere you sit down.

## Product Details

- **Brand:** SITTS
- **Special Feature:** Portable
- **Size:** Very Firm - 2.5 in
- **Fill Material:** Foam
- **Shape:** Wedge

## Images

![Posture Wedge Seat Cushion | Very Hard No Flex Cushion for Posture Correction | Pelvic Stability | Car | Chair seat for Office | Meditation (Hard 2.5 in) - Image 1](https://m.media-amazon.com/images/I/41F8qCHAXKL.jpg)
![Posture Wedge Seat Cushion | Very Hard No Flex Cushion for Posture Correction | Pelvic Stability | Car | Chair seat for Office | Meditation (Hard 2.5 in) - Image 2](https://m.media-amazon.com/images/I/61Exh+7rVmL.jpg)
![Posture Wedge Seat Cushion | Very Hard No Flex Cushion for Posture Correction | Pelvic Stability | Car | Chair seat for Office | Meditation (Hard 2.5 in) - Image 3](https://m.media-amazon.com/images/I/71hfscOV5KL.jpg)
![Posture Wedge Seat Cushion | Very Hard No Flex Cushion for Posture Correction | Pelvic Stability | Car | Chair seat for Office | Meditation (Hard 2.5 in) - Image 4](https://m.media-amazon.com/images/I/31kr+xPsy3L.jpg)
![Posture Wedge Seat Cushion | Very Hard No Flex Cushion for Posture Correction | Pelvic Stability | Car | Chair seat for Office | Meditation (Hard 2.5 in) - Image 5](https://m.media-amazon.com/images/I/714jZwpr5tS.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Finally -- a well designed, comfortable, and effective wedge cushion!
*by E***S on November 22, 2018*

Several things I deeply appreciate about this cushion. First, it works! I've been using mine for a little over a week and it's making a noticeable difference in my sciatic pain. I'm beyond grateful. Second, unlike most wedge cushions, this one is designed so the back of your legs aren't pressed into it. Third, it actually fits in my car seat so I can get the proper angle (knees below hips) when I drive. Fourth, it really is portable. Fifth, it's fairly firm (the others I tried were too soft/squishy) without being uncomfortable. Sixth, it comes in 3 different wedge heights. I ordered the 2.5" and just ordered a 3.25" and a 4" because different chairs have different angles. My back issues are degenerative, so this is part of my focus on postural correction to help minimize problems down the road. Thank you SITTS Perfect!!!UPDATE: It's now 2 1/2 years since I got my first Sitts Cushions. They are all 4 (yes 4!) of them going strong, including one that has been in my car 24/7 in heat and cold. They are as firm as they were when I got them. I can't recommend these enough if you have lower back or sciatic pain and need to upgrade how you sit, whether at home or in your car (and yes, it works perfect in my desk chair too.)

### ⭐⭐⭐⭐ Firm and supportive, but too thick for what I need
*by C***J on December 24, 2022*

This product is definitely firm and supportive, which is good to know with nearly every cushion out there being super soft memory foam that you sink into or causes it to flatten- which is super annoyingI have chronic pain and I need a wedge cushion for my car because of the slope of my seat causing strain on my upper body. I would be keeping the 3.5 inch one if it was a bit thinner, and I’m hoping to try a different size to see if it meets my needs in my small car. It was also a tad bit too firm, though I would think it will soften a little with time and would be more comfortable if it was the right height for my car’s seatEven though this particular product didn’t work out for me, wanted to mention in a review that it’s very supportive. Posture begins in the pelvis and it was much easier to rely on that and my core to sit upright and drive as opposed to straining my shoulders, neck, and jaw as I lean forward inn my seat where the bottom is sloping down where it meets the back. There was a little too much pressure on my piriformis muscles and sciatic nerve though, but I really want to try a shorter cushion that’s slightly softer from this brand!

### ⭐⭐⭐ Not what I expected- but a decent deal...
*by M***B on September 6, 2020*

These are made well, and come fast-- but harder than expected and has no kind of fabric or cover on it (so I made one)I can't use it, as it hurts my tailbone & lower back, but this may NOT be an issue for other people!(I have spinal damage from an injury)I think I'd use it if it weren't so dense/was slightly softer..... A bit pricey for a chunk of rubber....

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**Shop now:** [https://www.desertcart.jp/products/49870985-posture-wedge-seat-cushion-very-hard-no-flex-cushion-posture](https://www.desertcart.jp/products/49870985-posture-wedge-seat-cushion-very-hard-no-flex-cushion-posture)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-09*