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Trustpilot

THERMASLEEP

Mattress Cover to Cool or Heat Your Existing Mattress From 12°C to 55°C

Trustpilot

THERMASLEEP

Cools Your Existing Mattress To As Low As 12°C Or Heats Up To 55°C.

£799.99

How would you like to heat or cool your bed?

Both Sides

2 Pods

For couples who want a superior temperature-controlled sleeping experience by individually controlling each bedside.

For couples who want a superior temperature-controlled sleeping experience by individually controlling each bedside.

Most Popular

One Side

1 Pod

For couples who want temperature control for only one bedside.

For couples who want temperature control for only one bedside.

Full Bed

1 Pod

For solo sleepers, one temperature across the entire bed.

For solo sleepers, one temperature across the entire bed.

Help me decide

Select Your Bed Size

Double

King

Super King

Full Bed is not available in Super King.
Please choose Both Sides or Just 1 Side instead.

Free Next Day DPD Delivery

1 Year Warranty Included

smart mattress cover

Meet Your

perfect sleep

Thermasleep is a smart, water‑powered mattress cover that lets you control the exact temperature of your bed. No new mattress needed.

Thermasleep is a smart, water‑pod mattress cover that lets you control the exact temperature of your bed

Powered by water

temperature range

12°C

-

55°C

Fits Any Bed

Works with your Double, King or Super King mattress you already love.

Zero Compromise on Comfort

Just like a fitted sheet, you will barely feel, hear, or notice it.

Powered by Water, Not Wires

Safe, low-EMF comfort with consistent heating and cooling.

one topper. two zones.

End of the Blanket Battle

The Thermasleep mattress cover lets you each control your own temperature, so you can both be comfortable, all night long.

The Thermasleep lets you each control your own temperature , so you can both be comfortable, all night long.

her side

24°C

his side

16°C

Water-Powered Comfort


Microtubes Beneath the Surface

No Sacrifice on Comfort

Invisible tubes silently circulate temperature-regulated water without disrupting how your bed feels.

Maintain an even temperature across the mattress—without hot patches or chilly areas

Whisper-quiet

No air con or external noisy fans needed

Transform Your Existing Mattress

The Mattress Cover

Perfect for your Double, King or Super King mattress. 

Fits over your existing mattress

Fits any bed

Soft, breathable and invisible design

Cover with your regular bed sheet

Transform Your Existing Mattress

The Thermasleep is not a mattress. It transforms the one you already have.

sleep smarter

Save On Energy.
Sleep All Night.

Save On Energy.
Sleep All Night.

Heat or cool your bed, not your house.

Keep your duvet all year round

No noisy fan or bed heater needed 

cool paradise
all night

16°C

A Smarter Mattress Cover

Where Perfect Sleep Begins

Dual-Zone Option

Control the temperature across each side of the bed independently

Whisper-Quiet

Ultra quiet operation

Manual Control

Simplistic and seamless temperature adjustment

Fits Any Mattress

Seamlessly fits on top of your bed

Cool in summer, warm in winter

Year-round comfort with precise temperature control, to the nearest 1°

Year-round comfort, adapting to both your body, and the seasons.

Bed with dual temperature control system, showing blue and red cooling and heating units.

Compact. Quiet.

Made to Fit.

The Pod’s compact size fits neatly under or beside your bed, blending effortlessly into any space.

Compact. Quiet.

Made to Fit.

The Pod’s compact size fits neatly under or beside your bed, blending effortlessly into any space.

Small & Compact

Small & Compact Design

Discreet design that fits any bedroom, right next to your bed

Fast Cooling & Heating

Cooling or Heating in 30 Minutes

Reach your ideal sleep tempurature in just 30 minutes.

Whisper-Quiet

Whisper-Quiet, at just 55 dB

Operates at just 47 dB for peaceful, uninterrupted sleep.

temperature set

18°

16°

Whats Included

ALL MODELS INCLUDE

Thermasheet mattress cover

Thermasleep Pod

x1 for One Side/ Full Bed

x2 for Both Sides

Remote  Controller

User Manual

1 Year Warranty Certificate

How would you like to heat or cool your bed?

Both Sides

2 Pods

For couples who want a superior temperature-controlled sleeping experience by individually controlling each bedside.

Most Popular

Full Bed

1 Pod

For solo sleepers, one temperature across the entire bed.

One Side

1 Pod

For couples who want temperature control for only one bedside.

Help me decide

Select Your Bed Size

Better By Design

How We Compare

Thermasleep delivers precise, even temperature using safe, natural water flow.

Unlike traditional heating pads or electric blankets, Thermasleep delivers precise, even temperature using safe, natural water flow. No hotspots, no dry air, no overheating.

Thermasleep

Sleep at the perfect temp every night

As low as 12°C and stays consistent - you wake up refreshed

As high as 55°C and you don’t need to buy anything else

Precisely control temperature for each side of the bed

Temperature is set by you (and your partner)

White mattress with a quilted pattern on a gray background.

Your
“Cooling Mattress”

Sleeping temperature fluctuates all night

Claims to offer “cooling power”, but you wake up sweating

Requires a heavy duvet or electric blanket

Temperature is the same across the entire bed

Temperature is dictated by your environment