The Flux Sleep Water-Cooled Mattress Pad
Sale price$249.99Regular price
$349.99
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Ships from our warehouse in Tulsa, Oklahoma
Sleep Cooler, Wake Up Refreshed - Without Spending $2,000+
✓ No subscription
✓ Water cooling technology
✓ Works with any mattress
Cooling Mattress Pad Benefits
• Deeper, More Restorative Sleep
• Reduces Night Sweats & Overheating
• Improved Cognitive Function
• Supports Cardiovascular Health
• Reduces Stress & Cortisol Levels
• Helps Insomniacs Fall Asleep Faster
• Improves Sleep Consistency
• Reduces Risk of Sleep Disorders
• Boosts Immune Function
Mattress Dimensions
Twin
71" × 35" (1 mattress pad)
Full
71" × 54" (1 mattress pad)
Queen
60" × 75" (2 mattress pads)
King
76" × 76" (2 mattress pads)
California King
72" × 80" (2 mattress pads)
For Queen, King, and California King sizes, two mattress pads are included, which allows for independent temperature regulation on each side of the bed.
What's In The Box
• Main Unit: The core system responsible for refrigerating and circulating the water.
• Mattress Pad: A specially designed pad featuring an integrated network of micro-tubing the water flows through.
• Silicone Tubing: Securely connects the main unit to the mattress pad.
• User Manual & Welcome Guide: Includes setup instructions and helpful tips to get you started quickly.
For Queen, King, and California King sizes, two of each component are included, allowing independent temperature control for both sides of the bed.
Technical Specifications
Modes:
Eco: -5°F
Max: -10°F
Decibels: 33
Cooling Unit Dimensions: 9.65 x 7.48 x 4.53 Inches (L x W x H)
Cooling Unit Weight: 4 Pounds
Power Cord Length: 60 Inches
Watts:
Eco: 10W
Max: 70W
Power Voltage: 110v/120v (Standard US Outlet)
Hertz: 60hz (Standard US Oulet)
Connecting Tube Length: 40 Inches
Cooling Technology: Semiconductor Refrigeration
FCC Certified
Shipping Information
We ship worldwide with UPS.
Estimated Delivery Times
• USA: 2–3 business days
• Canada: 3-4 business days
• United Kingdom: 5–7 business days
• Australia: 5–7 business days
• Europe: 5–7 business days
Orders are dispatched from our U.S. fulfillment center in Oklahoma.
You’ll receive tracking once your order ships - typically within 1–2 days of purchase.
Warranty (1 Year) & Return Policy (100 Days)
Warranty
All Flux Sleep products include a 1-year manufacturer's warranty against any defects (leaks, breaks, etc.).
See our full warranty details here.
Return Policy
If you are unhappy with your Flux Sleep, you have 100 days to return it for a full refund.
See our full return policy here.
Note: To maintain strict hygiene and sanitary standards, returned products must be in unused condition.
Designed for Hot Sleepers. Built for Ultimate Comfort.
Affordable, Effective, and Whisper-Quiet Cooling for Healthier Sleep
All-Night Cooling
Stay cool, comfortable, all night.
Supports REM and Deep Sleep
Enhances rest for peak recovery.
Eliminate Body Sweat
Dry nights, better sleep guaranteed.
Works With Your Existing Setup
Compatible design, effortless integration.
Energy Efficient
Save energy without sacrificing comfort.
EMF Free
Sleep safely with zero worries.
Ultra-Quiet Operation
Whisper-quiet for undisturbed rest.
No Maintenance Required
Hassle-free sleep, zero upkeep needed.
All-Night Cooling
Stay cool, comfortable, all night.
Supports REM and Deep Sleep
Enhances rest for peak recovery.
Eliminate Body Sweat
Dry nights, better sleep guaranteed.
Works With Your Existing Setup
Compatible design, effortless integration.
Energy Efficient
Save energy without sacrificing comfort.
EMF Free
Sleep safely with zero worries.
Ultra-Quiet Operation
Whisper-quiet for undisturbed rest.
No Maintenance Required
Hassle-free sleep, zero upkeep needed.
Active Water Circulation for Sweat-Free, Deep Sleep All Night Long.
Hot Sleepers, Meet Your Match
Experience the difference of active water cooling that draws heat away from your body, preventing night sweats and interruptions for deeper, restorative sleep.
With ultra-quiet operation and customizable temperature controls, get ready for your best night's sleep ever.
Affordable Sleep Tech, Finally
Forget complex, $3,000 mattress setups. The Flux Sleep provides the same cooling power, but for less than 1/10th of the price of the typical high-end system.
Plus, there are no recurring subscriptions, ever. Pay once, and enjoy for a lifetime.
Works With Any Bedroom Setup
Don’t replace your bed. Just upgrade it. The slim, flexible design effortlessly slides between your mattress and fitted sheet, instantly transforming your sleep without changing your setup.
King and Queen sizes come with two units, allowing you to independently control the temperature on each side.
Why Choose Flux Sleep?
Flux Sleep vs. The 'Other Guys'
| Features |
Flux Sleep
|
Other Guys
|
|---|---|---|
| Starting At $199 | ||
| No Subscription Required | ||
| No EMFs | ||
| Energy Efficient | ||
| 5-Minute Setup |
Simple 5 Minute Setup
1. Unfold & Place Pad
Unfold the mattress pad and place it between your mattress and your sheets.
2. Fill Tank & Plug In
Fill the water tank with regular tap water and plug it in.
3. Sleep Cool Tonight!
Turn it on and enjoy a temperature-controlled bed within minutes.
Guaranteed Satisfaction With Flux Sleep
Helen K. | ⭐️⭐️⭐️⭐️⭐️
"I tried everything - melatonin, blackout curtains, white noise. But nothing helped me actually stay asleep. This was the first thing that made a real difference. It’s like my body finally got permission to relax."
Erika S. | ⭐️⭐️⭐️⭐️⭐️
"I used to dread going to bed because I knew I’d be up by 2 a.m. soaked in sweat. Now I sleep through the night and actually look forward to getting into bed. It’s like my bedroom finally matches the calm I want to feel."
James R. | ⭐️⭐️⭐️⭐️⭐️
“I wanted an cooling mattress topper but couldn’t justify dropping thousands. This gave me everything I wanted, with no app BS, no subscription. Just sleep that feels effortless. My only regret is not buying it sooner.”
"Flux Sleep was rated as the best new cooling mattress pad of 2025"
Sarah Johnson
TechSmart
Join Thousands of Happy Flux Sleep Users
Meet Our Expert
With Over 25 Years Of Experience
"The Flux Sleep cooling mattress offers a thoughtful combination of temperature regulation, comfort, and support.
Improving sleep is one of the most rewarding lifestyle interventions a person can invest in. Better sleep is associated with better stress management, enhanced mental clarity and concentration, and improved daytime function.
For individuals who struggle with overheating at night or who simply want to optimize their sleep quality, Flux Sleep is an evidence-based product I confidently recommend as part of a healthier sleep routine."
Frequently Asked Questions
How cold does the Flux Sleep get?
The Flux Sleep features two cooling modes designed to help you find your perfect sleep temperature:
- Eco Mode: Ideal for all-night comfort, this mode lowers your bed temperature by -5°F.
- Max Mode: Povides a deeper chill, dropping the temperature by -10°F.
How is the Flux Sleep cooled?
The Flux Sleep uses active semiconductor refrigeration (not just a fan) to chill water and circulate it through a network of micro-tubes inside the mattress pad.
How loud is the Flux Sleep?
The Flux Sleep is extremely quiet - just 33 decibels when operating.
To give you an idea, 33 dB is roughly the sound of a soft whisper or a quiet library. It is significantly quieter than a standard bedside fan or a window AC unit. In a typical room, you’ll likely forget it’s even running.
How much power does the Flux Sleep use?
Barely any! In Eco mode, the Flux Sleep draws about 10 watts - less than a standard LED light bulb. In Max mode, it uses about 70 watts.
To put that in perspective: a window AC unit pulls 500-1,500 watts, a portable space heater draws 1,000-1,500 watts, and other high-end cooling mattress systems use 100-150 watts. The Flux Sleep on Max is less than half of what those other cooling systems use, and in Eco mode it's practically nothing.
At typical US electricity rates, you're looking at a few cents per night to run it. So you can keep it running all night without worrying about your power bill!
Can the cooling unit be placed on the ground?
Yes, the machine can be placed on the floor - that works totally fine!
Our promotional photos show it on the bedside table to display the details more prominently.
Can I control each side of the bed independently?
Yes! Our Queen and King systems are designed for total "Dual-Zone" customization. Instead of one unit trying to please two people, we provide two dedicated cooling systems - one for each side of the bed.
Does the Flux Sleep require a subscription?
No. When you buy the Flux Sleep, you own it. We don’t believe in charging you a "monthly rent" to sleep in your own bed. There are no hidden fees, no locked features, and no memberships required. Every cooling benefit is available to you from day one, forever.
Can I pay with HSA/FSA?
Yes! We accept HSA and FSA payments through our partnership with TrueMed.
By selecting the TrueMed option at checkout, you can use your health savings funds for eligible purchases. This process ensures your items meet the necessary medical necessity requirements, making it easier than ever to invest in your health using pre-tax dollars.
How it works:
- Select TrueMed: Choose the TrueMed payment option at checkout.
- Quick Qualification: You’ll complete a brief, integrated health survey to determine eligibility.
- Checkout: Once approved, you can use your HSA/FSA card just like a regular credit card.
Note: If you don't have your HSA/FSA card handy, TrueMed also provides instructions on how to submit your receipt for reimbursement after purchasing with a standard payment method.
Does the Flux Sleep need an app?
No app required! We designed the Flux Sleep to be "digital-detox" friendly. You can switch between Eco and Max modes directly on the unit with a simple button press. There’s no need to fumble with your phone, check for firmware updates, or deal with spotty Wi-Fi in the middle of the night.
Does the Flux Sleep require a new mattress?
No, you can keep the mattress you already love. The Flux Sleep is designed to be a universal "add-on" system. It features a thin, comfortable cooling pad that slides right on top of your current mattress. Simply place the pad under your fitted sheet, connect it to the control unit, and you’ve instantly upgraded your existing bed!
Does the pad go under the sheets, or am I laying directly on the pad?
The pad goes between your mattress and your fitted sheet, so you are not sleeping directly on it.
There are photos on our website where it's shown on top of the bed - that's just so you can actually see the pad for demonstration purposes. In real use, it's always tucked under the sheets.
What kind of water should be used?
Tap water works perfectly fine!
If you want to go the extra mile, distilled water is recommended for longevity of the machine, but is definitely not required.
How often do I need to refill the water?
Not very often. Because the Flux Sleep operates as a semi-closed loop, evaporation is kept to an absolute minimum. In a standard bedroom environment, you will typically only need to "top off" the reservoir once every 4 to 8 weeks.
What cleaning & maintenance is needed?
Very little! Just wipe down the control unit with a damp cloth occasionally and refresh the water in the tank every now and then. The mattress pad can be spot cleaned as needed. That's it - no complicated upkeep required.
Can the Flux Sleep be used with an adjustable bed?
Yes, the Flux Sleep works great with adjustable beds!
The silicone tubing is incredibly durable, so even if it gets bent a little during adjustments, it won't break. Just try to be conscious of not pinching the tubes when you're raising or lowering the bed, so water can still flow through them.
The connecting hose is 40 inches long, so just measure the distance from your floor/nightstand to the mattress to make sure it reaches comfortably.
Is there a weight limit for the Flux Sleep?
No, there is no weight limit. Our cooling pad is engineered with durable, medical-grade silicone tubing that is designed to withstand the pressure of any body type without kinking or restricting water flow. Whether you sleep alone or share the bed with a partner (and the dog!), the Flux Sleep will continue to circulate water.
Can I travel with the Flux Sleep?
While not specifically designed as a travel product, plenty of people do take it on the go without any issues.
The cooling unit is quite compact: just 9.65 x 7.48 x 4.53 inches and roughly 4 lbs. The pad folds up as well.
If you're packing other items like clothes, we would definitely recommend using a checked bag to fit everything. The Flux Sleep could definitely fit in a carry-on, but there wouldn't be a lot of room left for other items.
Didn't Find Your Answer?
Don't hesitate to contact us!