---
product_id: 650832245
title: "TranquilRelax XL Memory Foam Seat Cushion for Office Chair, 3.35-Inch, Gray | Medium-firm Support for Long Sitting, Washable Mesh Cover, Non-slip Base, Perfect for Car Seats & Short Drivers"
brand: "tranquilrelax"
price: "¥28021"
currency: JPY
in_stock: true
category: "Tranquil Relax"
url: https://www.desertcart.jp/products/650832245-tranquilrelax-xl-memory-foam-seat-cushion-for-office-chair-3
store_origin: JP
region: Japan
---

# 3.35-inch height boost Non-slip rubber base High-density memory foam TranquilRelax XL Memory Foam Seat Cushion for Office Chair, 3.35-Inch, Gray | Medium-firm Support for Long Sitting, Washable Mesh Cover, Non-slip Base, Perfect for Car Seats & Short Drivers

**Brand:** tranquilrelax
**Price:** ¥28021
**Availability:** ✅ In Stock

## Summary

> 💺 Upgrade your seat, upgrade your day—comfort that commands attention!

## Quick Answers

- **What is this?** TranquilRelax XL Memory Foam Seat Cushion for Office Chair, 3.35-Inch, Gray | Medium-firm Support for Long Sitting, Washable Mesh Cover, Non-slip Base, Perfect for Car Seats & Short Drivers by tranquilrelax
- **How much does it cost?** ¥28021 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/650832245-tranquilrelax-xl-memory-foam-seat-cushion-for-office-chair-3)

## Best For

- tranquilrelax enthusiasts

## Why This Product

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

## Key Features

- • **Elevate Your View:** Instant 3.35-inch seat height boost for enhanced visibility and reach—perfect for short drivers and office pros.
- • **Stay Put & Stay Fresh:** Anti-slip rubber base locks cushion in place while breathable, machine-washable mesh cover keeps hygiene effortless.
- • **Ergonomic Posture Power:** Beveled edge design promotes natural pelvic alignment, reducing back, hip, and thigh strain during marathon workdays.
- • **Extra-Large Comfort Zone:** Spacious 18.5" x 16.9" cushion fits all adults comfortably, ideal for office chairs, car seats, and wheelchairs alike.
- • **Resilient Medium-Firm Support:** Premium memory foam maintains shape all day—no sinking, no flattening, just stable comfort that lasts.

## Overview

The TranquilRelax XL Memory Foam Seat Cushion offers a 3.35-inch ergonomic height boost with medium-firm, high-density memory foam designed to improve posture and reduce pressure on key areas like the coccyx and sciatic nerve. Its extra-large size and beveled edges support natural pelvic alignment, making it ideal for long hours at the desk, driving, or recovery. Featuring a non-slip rubber base and a breathable, removable mesh cover, this cushion combines durability, hygiene, and comfort for professionals seeking reliable, all-day support.

## Description

Buy TranquilRelax XL Memory Foam Seat Cushion for Office Chair, 3.35-Inch, Gray | Medium-firm Support for Long Sitting, Washable Mesh Cover, Non-slip Base, Perfect for Car Seats & Short Drivers: Back & Seat Cushions - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

## Features

- 【3.35-Inch Height Boost & Targeted Comfort】 Instantly raise your seat height by 3.35 inches for better visibility and reach! Combined with an ergonomic beveled edge design, this high-density memory foam cushion helps minimize pressure on your coccyx, tailbone, and sciatic area, offering soothing comfort for long sitting hours or post-surgery support
- 【Improves Posture & Reduces Back Strain】 Turn any hard chair into an ergonomic seat. The thoughtful beveled edge design encourages a natural, upright sitting posture by supporting proper pelvic alignment. This helps distribute your weight evenly, reducing strain on your lower back, hips, and thighs - whether you're working 8+ hours at a desk or on a long drive
- 【Medium-Firm Support That Won't Flatten】 Please note: To provide proper ergonomic support, this cushion is intentionally designed with a Medium-Firm feel, NOT a plush, sink-in feel. If you prefer ultra-soft foam, this may not be the right fit. Unlike soft cushions that quickly bottom out, our premium memory foam holds its shape all day, providing stable, resilient lift that won't flatten over time
- 【Extra Large & Perfect for Short Individuals】 Measuring 18.5" x 16.9", this cushion accommodates adults comfortably while providing the perfect 3.35-inch height boost. Ideal for short drivers needing better road visibility, seniors needing extra height to transition in and out of chairs, wheelchair users, and anyone seeking reliable support for office chairs, car seats, dining chairs, and travel situations
- 【Non-Slip Rubber Base & Easy to Wash】 Say goodbye to constant adjusting! A sturdy anti-slip rubber bottom locks the cushion securely in place, so it won't slide around on your office chair, car seat, or wheelchair. The breathable mesh cover features a durable zipper, making it easily removable and machine-washable for hassle-free hygiene

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0D1V6GC8J |
| Age Range Description | Adult |
| Best Sellers Rank | #1,029 in Office Products ( See Top 100 in Office Products ) #6 in Back Cushions & Seat Cushions |
| Brand Name | TranquilRelax |
| Color | Gray |
| Customer Reviews | 4.3 4.3 out of 5 stars (2,235) |
| Fabric Type | 100% Polyester Mesh Cover |
| Fill Material | Memory Foam |
| Item Dimensions L x W | 16.92"L x 18.5"W |
| Item Firmness Description | Medium Firm |
| Manufacturer | TranquilRelax |
| Manufacturer Part Number | MPN-TR0001-L-GE |
| Material Features | Breathable, Moisture Wicking |
| Material Type | Memory Foam |
| Material Type Free | Formaldehyde Free, Latex Free |
| Model Name | MPN-TR0001-L-GE |
| Model Number | MPN-TR0001-L-GE |
| Number of Pieces | 1 |
| Pattern | Solid |
| Product Care Instructions | The memory foam core is not washable. For easy care, remove the zippered cover and machine wash cold on a gentle cycle. Do not bleach or tumble dry. Air dry completely before reusing. |
| Recommended Uses For Product | Driving, Reading, Resting, Sitting, Traveling |
| Shape | Rectangular |
| Size | X-Large |
| Special Features | Anti-Slip, Moisture-Wicking, Portable, Removable Cover, Breathable |
| Specific Uses For Product | Casual sitting, Long-haul drivers, Office workers, Work-from-home |
| Target Use Body Part | Buttocks, Legs |
| Unit Count | 1 Count |

## Product Details

- **Brand:** TranquilRelax
- **Color:** Gray
- **Fill Material:** Memory Foam
- **Size:** X-Large
- **Special Feature:** Anti-Slip, Moisture-Wicking, Portable, Removable Cover, Breathable

## Images

![TranquilRelax XL Memory Foam Seat Cushion for Office Chair, 3.35-Inch, Gray | Medium-firm Support for Long Sitting, Washable Mesh Cover, Non-slip Base, Perfect for Car Seats & Short Drivers - Image 1](https://m.media-amazon.com/images/I/81fbh2O32gL.jpg)
![TranquilRelax XL Memory Foam Seat Cushion for Office Chair, 3.35-Inch, Gray | Medium-firm Support for Long Sitting, Washable Mesh Cover, Non-slip Base, Perfect for Car Seats & Short Drivers - Image 2](https://m.media-amazon.com/images/I/71-npehpNmL.jpg)
![TranquilRelax XL Memory Foam Seat Cushion for Office Chair, 3.35-Inch, Gray | Medium-firm Support for Long Sitting, Washable Mesh Cover, Non-slip Base, Perfect for Car Seats & Short Drivers - Image 3](https://m.media-amazon.com/images/I/81HZsoqnvmL.jpg)
![TranquilRelax XL Memory Foam Seat Cushion for Office Chair, 3.35-Inch, Gray | Medium-firm Support for Long Sitting, Washable Mesh Cover, Non-slip Base, Perfect for Car Seats & Short Drivers - Image 4](https://m.media-amazon.com/images/I/71QKO3D5rSL.jpg)
![TranquilRelax XL Memory Foam Seat Cushion for Office Chair, 3.35-Inch, Gray | Medium-firm Support for Long Sitting, Washable Mesh Cover, Non-slip Base, Perfect for Car Seats & Short Drivers - Image 5](https://m.media-amazon.com/images/I/71gGZ6HhFoL.jpg)

## Available Options

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

## Questions & Answers

**Q: Is this cushion soft or firm?**
A: This cushion is designed with medium-firm support for stable, long-lasting comfort rather than a plush or ultra-soft feel. It helps maintain support and seat height during long sitting hours without flattening over time.

**Q: Is this cushion good for long sitting hours?**
A: Yes. The high-density memory foam is designed to provide stable ergonomic support during extended sitting sessions at work, driving, gaming, travel, or everyday use.

**Q: Will it slide around on my chair?**
A: No. The anti-slip rubber base helps keep the cushion securely in place on office chairs, car seats, wheelchairs, and dining chairs.

**Q: Is this cushion made with safe materials?**
A: Yes. The cushion is OEKO-TEX STANDARD 100 certified, meaning the materials have been tested against harmful substances and meet strict safety standards.

**Q: Who should buy this cushion?**
A: Adults who sit for extended hours — office workers, remote workers, drivers, and anyone who needs ergonomic seat support and a height boost.

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**Shop now:** [https://www.desertcart.jp/products/650832245-tranquilrelax-xl-memory-foam-seat-cushion-for-office-chair-3](https://www.desertcart.jp/products/650832245-tranquilrelax-xl-memory-foam-seat-cushion-for-office-chair-3)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-08-13*