---
product_id: 666827201
title: "Perfect Sleeper X - Knox 13.5\" Firm Queen Quilted Hybrid Mattress - 5 Support Zones and Cooling Tech for a Restorative Sleep - 100 Night Trial, CertiPUR-US Certified"
brand: "serta"
price: "₨998087"
currency: LKR
in_stock: true
url: https://www.desertcart.lk/products/666827201-perfect-sleeper-x-knox-13-5-firm-queen-quilted-hybrid
store_origin: LK
region: Sri Lanka
---

# 5-zone coil & memory foam support Graphite-infused cooling tech 13.5" firm hybrid thickness Perfect Sleeper X - Knox 13.5" Firm Queen Quilted Hybrid Mattress - 5 Support Zones and Cooling Tech for a Restorative Sleep - 100 Night Trial, CertiPUR-US Certified

**Brand:** serta
**Price:** ₨998087
**Availability:** ✅ In Stock

## Summary

> ❄️ Sleep smart, stay cool, wake unstoppable.

## Quick Answers

- **What is this?** Perfect Sleeper X - Knox 13.5" Firm Queen Quilted Hybrid Mattress - 5 Support Zones and Cooling Tech for a Restorative Sleep - 100 Night Trial, CertiPUR-US Certified by serta
- **How much does it cost?** ₨998087 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/666827201-perfect-sleeper-x-knox-13-5-firm-queen-quilted-hybrid)

## Best For

- serta enthusiasts

## Why This Product

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

## Key Features

- • **Firm Yet Plush Comfort:** Ideal for stomach and back sleepers craving firm support without sacrificing plush quilted softness.
- • **Advanced Cooling System:** Graphite-infused memory foam actively redistributes heat, keeping you cool and refreshed till dawn.
- • **Certified Peace of Mind:** CertiPUR-US certified foams and a 100-night trial ensure a safe, risk-free investment in your sleep.
- • **Targeted 5-Zone Support:** Precision-engineered coils and memory foam cradle your spine and pressure points for all-night alignment.
- • **Full-Size, No Compromise:** Shipped uncompressed and assembled in the USA for uncompromised quality and durability.

## Overview

The Serta Perfect Sleeper X Knox is a 13.5-inch firm hybrid queen mattress featuring a 5-zone coil and memory foam system for targeted spinal alignment and pressure relief. Its graphite-infused cooling technology ensures temperature regulation throughout the night. Certified by CertiPUR-US and backed by a 100-night trial, this mattress is shipped full-size from the USA, combining durability with premium comfort tailored for stomach and back sleepers.

## Description

Perfect Sleeper X - Knox 13.5" Firm Queen Quilted Hybrid Mattress - 5 Support Zones and Cooling Tech for a Restorative Sleep - 100 Night Trial, CertiPUR-US Certified

## Features

- Firm Feel: Ideal for stomach and back sleepers with extra support; This quilted top hybrid mattress is not compressed into a smaller box and is Assembled in the USA
- Support: Serta's 5 Zone Response Design combines coils and contouring memory foam for full body spinal alignment; Plush coils contour and cradle your pressure points while firm coils support the natural curves of your body
- Pressure Relief: Serta's Perfect Conform memory foam works with the mattresses coils to further contour and cradle your pressure points for a rejuvenating sleep
- Cool Feel System: This cooling technology utilizes graphite infused memory foam to promote heat distribution and keep you comfortable throughout the night
- Certified: All Serta Perfect Sleeper mattresses feature a 100 Night Trial, a 10-Year Limited Warranty, and CertiPUR-US certified foams free of harmful chemicals, so you can rest easy; Plus, all mattresses are compatible with adjustable bases
- Shipping/Manufacturing Note due to the high-quality manufacturing and substantial components contained within this mattress it cannot be compressed and is shipped ‘full-size’. Delivery Services availability and add-on costs determined by region. If Delivery services are available in your area you will be prompted to add them to your cart at checkout. Otherwise, Mattress will come standard with ‘door-drop-off’. If Delivery Services are not available in your region it is recommended you seek assistance/multiple persons to move due to the products heavy-bulky nature.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Material Type | Memory Foam, pocketed coils |
| Fill Material | Pocketed Coils, Memory Foam |
| Product Care Instructions | We do not recommend applying liquids to the product. Applying liquids may stain the fabric and could potentially make the soiled area worse. Moisture or chemicals applied directly to the mattress can cause premature breakdown of the foam and damage the product., To clean your mattress, we suggest applying baking soda to the soiled area and letting it stand for about 15 minutes. Then, vacuum and repeat as needed. It's important that you also air the product out as much as possible., In order to protect your mattress from stains and spills, we recommend using a mattress protector. This will also help with the overall health and lifespan of your mattress. |
| Cover Material | Polyester Blend |
| Item Weight | 78.6 Pounds |
| Item Dimensions L x W x Thickness | 79.5"L x 60"W x 13.5"Th |
| Size | Queen |
| Color | Black |
| Top Style | Tight Top |
| Is Customizable? | No |
| Construction Type | Hybrid |
| Portable | No |
| Is Foldable | No |
| Special Features | Temperature Regulating, Durable, Pressure Relief, Breathable, Low Motion Transfer |
| Item Firmness Description | Firm |
| Number of Layers | 7 |

## Product Details

- **Brand:** Serta
- **Size:** Queen
- **Product Dimensions:** 79.5"L x 60"W x 13.5"Th
- **Top Style:** Tight Top
- **Cover Material:** Polyester Blend
- **Number of Layers:** 7
- **Fill Material:** Memory Foam, Pocketed Coils
- **Special Feature:** Breathable, Durable, Low Motion Transfer, Pressure Relief, Temperature Regulating
- **Color:** Black
- **Coil Type:** Pocketed Coil

## Images

![Perfect Sleeper X - Knox 13.5" Firm Queen Quilted Hybrid Mattress - 5 Support Zones and Cooling Tech for a Restorative Sleep - 100 Night Trial, CertiPUR-US Certified - Image 1](https://m.media-amazon.com/images/I/91XPzwOe6eL.jpg)

## Available Options

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

## Frequently Bought Together

- Serta Perfect Sleeper X - Knox 13.5" Firm Queen Quilted Hybrid Mattress - 5 Support Zones and Cooling Tech for a Restorative Sleep - 100 Night Trial, CertiPUR-US Certified
- Novilla Queen Bed Frame, 14 Inch Metal Platform Bed Frame Queen Size with Storage Space Under Bed, Heavy Duty Steel Slat Support, Easy Assembly, No Box Spring Needed
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**Shop now:** [https://www.desertcart.lk/products/666827201-perfect-sleeper-x-knox-13-5-firm-queen-quilted-hybrid](https://www.desertcart.lk/products/666827201-perfect-sleeper-x-knox-13-5-firm-queen-quilted-hybrid)

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*Product available on Desertcart Sri Lanka*
*Store origin: LK*
*Last updated: 2026-02-15*