How to Use the Breg Polar Care Cube: Setup, Ice & Safety Tips

How to Use the Breg Polar Care Cube Cold Therapy Machine

Written by Supply Physical Therapy · Reviewed by Dr. Dina Khentigan, DNP

A step-by-step guide to setting up your Breg Polar Care Cube after surgery: the right ice-to-water fill, connecting your pad, protecting your skin and keeping the machine running smoothly.

Just got home from surgery and staring at a new ice machine? You are not alone. The Breg Polar Care Cube is one of the simplest cold therapy machines to use, but a few small details make a big difference in how cold it stays, how long it runs and how safe it is for your skin.

In this guide, our team walks you through the same steps we show in our video:

• Unboxing the Cube safely and checking that you have every part
• Filling it to the correct water and ice lines
• Choosing between ice freeze bags, frozen water bottles, gel packs and regular ice
• Applying your pad with a skin barrier or sterile dressing
• Connecting the hose and powering on
• Using cold therapy safely and avoiding common mistakes
• Troubleshooting and caring for your machine

Important: This guide is general education, not medical advice. Your surgeon's or physical therapist's instructions always come first. Cold therapy devices are sold by or on the order of a licensed healthcare provider.

[Video placement: embed "How to Use Breg Polar Care Cube Cold Therapy Machine (Setup & Recovery Tips)" from Movement Health's YouTube channel here]

Step 1: Unbox Your Polar Care Cube Safely

When your Cube arrives from Supply Physical Therapy, open the box carefully. The tubing sometimes sits right at the top of the box, so lift the flap slightly and cut slowly with a shallow blade. One deep cut can slice the hose before you ever use it.

Check what's inside

Match your pad and dressing part numbers

Pads and dressings are sized by body part, and the part number is printed on the front of each package. For example, in our video we use a large knee setup:

• Large knee pad: part number 04703
• Large knee sterile dressing: part number 04708

Check that the numbers match what you ordered before you open anything. Sealed pads and dressings can only be returned unopened. Once the bag is opened, it can't come back.

Not sure which knee size you need? Read our Polar Care Cube knee pad size guide, or watch the short video below to measure your thigh and match your part number.

Prefer to watch? Watch the Breg Polar Care Cube Knee Pad Sizing Guide & Part Numbers on YouTube from Movement Health by Supply Physical Therapy.

Step 2: Fill the Cube with Water and Ice

The right ice-to-water ratio is marked inside the Cube for you. Open the lid and you'll see two fill lines: one for water and one for ice.

1. Add water first. Pour cool water in until it reaches the water fill line.
2. Add ice to the ice fill line. Use any of the options below.
3. Quick-chill tip: For the first 30 minutes, add a handful of loose ice on top of your blocks. Loose ice chills the water fast, and the blocks then keep it cold for roughly 2 to 5 hours, so you aren't refilling constantly.
4. Close it up. Put the lid back on and lock the handle into place.

Which ice should you use?

Why the label matters: Shredded paper and glue from a water bottle label can get pulled into the pump and clog it, stopping the machine. That kind of damage may also void your warranty. The last thing you want during recovery is to be without your ice machine.

Why freeze bags save you effort: A full Cube can be heavy, especially if you're on a walker or cane. Ice blocks last longer than loose ice, so you lift and refill the cooler less often.

Step 3: Apply Your Pad and Connect the Cube

Never put a cold therapy pad directly on bare skin. Always place a barrier between the pad and your skin.

Sterile dressing or skin barrier?

• Sterile dressing: Use this over a fresh surgical incision. Many surgeons and surgery centers ask patients to bring one on surgery day.
• Skin barrier: A non-sterile layer for everyday sessions once your incision is covered or healed.
• No barrier on hand? You can treat over your surgical dressing or a thin layer of clothing, as long as the pad never touches bare skin.

For a deeper look at why this layer matters, read Why You Should Always Use a Sterile Pad with Cold Therapy.

Put the pad on (knee example)

1. Peel the tabs off the back of the skin barrier and press it onto the pad.
2. Place the pad on your knee with the barrier side against your skin.
3. Undo the bottom strap's Velcro, position it and fasten it.
4. Fasten the next strap, then adjust all the straps so the pad is snug but comfortable.

Straps should hold the pad in contact without squeezing. If your toes or fingers tingle, turn cold, or change color, loosen the straps.

Connect the hose and power on

1. Press in the two metal clips on the Cube's connector.
2. Push the pad's hose into the connector until you hear a click.
3. Plug the power supply into the back of the Cube, then into the wall.

Cold water will start circulating through the pad. Your treatment has begun.

Need more reach between your bed or recliner and the cooler? A 4-foot extension tube adds length. To treat two areas at once, a dual "Y" pad connector runs two pads from one Cube.

Step 4: Use Cold Therapy Safely

The universal protocol is 20 minutes on, 20 minutes off, unless your surgeon or physical therapist gives you a different schedule. Some providers prescribe 20 minutes, others 30 or longer. Your provider's instructions always win. For help planning sessions around your day, see the best cold therapy schedule for home recovery.

Keep the Cube level with your pad

Set the cooler on the same level as the pad, such as a nightstand beside your bed or a stool next to your recliner. When the Cube sits on the floor below you, the pump has to work harder to push water up to the pad. You'll lean on this machine heavily for the first two to four weeks after surgery, and you don't want the motor to burn out.

Check your skin every session

Stop and remove the pad if you notice:

• Numbness that doesn't go away after the pad is off
• Burning, stinging or sharp pain
• Skin that turns white, gray, blotchy, blue or very red
• Blisters or hard, waxy-looking skin

Take extra care if you have reduced sensation

You may not feel a cold injury developing if:

• A nerve block from surgery is still wearing off
• You have diabetes with neuropathy, Raynaud's phenomenon, or poor circulation
• You're very sleepy from pain medication

Talk to your provider before using cold therapy if any of these apply. Don't use the Cube while you sleep unless your surgeon specifically tells you to.

What the research says

Cold therapy is widely used after orthopedic surgery, and the evidence supports it as a helpful, modest tool rather than a cure-all:

• A Cochrane systematic review of cryotherapy after total knee replacement (Adie and colleagues, 2012) found small short-term benefits for blood loss and pain, with low-quality evidence and no clear effect on range of motion.
• Published case reports describe frostbite and cold-related nerve injuries when cold devices were used for long, uninterrupted sessions or directly on the skin. A barrier and scheduled breaks are your best protection.
• Colder is not better. Consistent, scheduled sessions with a barrier are safer than pushing the temperature or time.

The takeaway: use cold therapy as part of your surgeon's plan, alongside your medications, elevation and physical therapy.

Troubleshooting and Care

Most Cube problems come down to the connection, the water level or something in the pump.

Keep it clean and ready

• Empty the water after each day of use and let the cooler air-dry with the lid open.
• Wipe the cooler and pad exterior with a mild soap solution, following the instructions that came with your Cube.
• Store the pad flat or loosely rolled so the tubing doesn't crease.
• Moving between rooms or traveling? A cold therapy carry bag holds the Cube and pad together.

Still stuck? Call our team at (844) 505-8144, Monday through Friday, 9 a.m. to 4 p.m. ET.

Frequently Asked Questions

How much ice and water go in the Polar Care Cube?

Fill water to the water line inside the lid first, then add ice to the ice line. The lines set the correct ice-to-water ratio for you, so there's no measuring.

How long does the ice last in the Cube?

With frozen blocks such as ice freeze bags, the water typically stays cold for about 2 to 5 hours. Loose ice melts faster. Add a little loose ice on top for the first 30 minutes to chill the water quickly.

Can I use frozen water bottles instead of ice?

Yes. Remove the label and all the glue first. Paper and adhesive can clog the pump, stop the machine and may void your warranty.

Can I put the pad directly on my skin?

No. Always use a sterile dressing over a fresh incision, or a skin barrier for routine sessions. A surgical dressing or thin clothing works if you have nothing else.

What's the difference between a sterile dressing and a skin barrier?

A sterile dressing is made for use over a fresh surgical incision, and many surgery centers require one. A skin barrier is non-sterile and protects your skin during regular sessions.

How long should I use the Cube each session?

The universal protocol is 20 minutes on and 20 minutes off. Your surgeon or physical therapist may prescribe something different, and their instructions come first.

Can I sleep with the Polar Care Cube running?

Only if your surgeon specifically tells you to. While asleep, you can't notice the early signs of cold injury.

Why isn't cold water reaching my pad?

Check that the hose clicked into the connector, the tubing isn't kinked and the cooler is level with the pad. Then make sure the water is at the fill line.

Where should I put the Cube during treatment?

Set the Cube on a flat, stable surface at about the same height as the pad. The Cube's pump has to push cold water up the tubing to the pad and back. When the cooler sits on the floor and you're lying in bed or a recliner, the pump works harder against that height difference. That can weaken the water flow, make the pad feel less cold and wear out the motor sooner. You'll likely use the Cube several times a day for the first two to four weeks after surgery, so placement matters.

Good spots include:

• In bed: a nightstand or bedside table next to the side you're treating.
• In a recliner: a side table, sturdy stool or TV tray next to the chair.
• On the couch: a coffee table or end table pulled close to you.

A few more tips:

• Keep it close. The tubing should reach the pad without being pulled tight. A taut hose can pop loose from the connector or tip the cooler over. If you need more reach, add a 4-foot extension tube.
• Keep the hose clear. Make sure the tubing isn't pinched under a pillow, blanket or your leg, and that it doesn't hang where you or a pet could trip on it.
• Protect your furniture. Put a towel under the Cube to catch condensation or drips, especially when you connect or disconnect the hose.
• Plan for refills. A full Cube can be heavy. Pick a spot that's easy for you or a caregiver to reach when it's time to add ice or water, so you're not carrying it around the house on crutches, a walker or a cane.

Does the Cube come with a pad?

It depends on what you order. You can buy the Cube cooler only or a Cube system with a wrap-on pad for your knee, shoulder, hip, ankle or back.

Can I return an opened pad or dressing?

No. Pads and dressings ship in sealed bags and can only be returned unopened. Check the part number on the front before opening.

Can I use one Cube for two body parts?

Yes, with a dual "Y" pad connector that runs two pads at once.

Do I need a prescription for the Polar Care Cube?

Federal law restricts this device to sale by or on the order of a licensed healthcare practitioner. Many patients receive an order from their surgeon. Call our team at (844) 505-8144 with questions.

Is the Polar Care Cube FSA or HSA eligible?

Many of our Cube systems and accessories are. Browse our FSA/HSA eligible products.

Products in This Guide

Shop the full Breg Polar Care Cube collection or browse Cube accessories.

Related Reading

• Why You Should Always Use a Sterile Pad with Cold Therapy
• How to Size Breg Polar Care Cube Knee Pads & Avoid Cold Injury
• Rotator Cuff Surgery Recovery: Complete Physical Therapy, Exercises & Equipment Guide
• The Best Cold Therapy Schedule for Home Recovery
• Top 5 Cold Therapy Tips for Shoulder Surgery Patients

Final Thoughts

A well-set-up Cube does its job quietly: fill to the lines, protect your skin, keep the cooler level with your pad and follow your provider's schedule. Get those right and your machine will keep you cool and comfortable through the toughest weeks of recovery.

Questions about your Cube, pads or accessories? Call Supply Physical Therapy at (844) 505-8144 or shop at SupplyPT.com.

Medical disclaimer: This article is for general education only and is not a substitute for advice from your surgeon, physician or physical therapist. Read our full medical disclaimer.