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Thermalution Surf Series (15M)

Usually Ships in 24 hours.
Undersuit Heat Up Time:
Heats up in under a Minute
Battery Duration:
Battery Duration: 1.5-2.5 hours (depends on temperature setting)
Maximum Water Pressure Depth:
Dive up to 70ft below the Surface
Micro Controller Settings:
Temperature Settings: Low, Medium and High
12 Month Limited Warranty
Thermalution is tested and certified to CE, TUV and UL and IP waterproof standards
Product Includes:
Product Includes: Undrshirt, Two Batteries, Charger and Controller

Product Description

The Thermalution® Power Heated Undersuit is the world’s first battery powered undersuit, designed to keep you toasty warm, even in the coldest conditions.  Powered by two 7.4 volt Lithium Polymer batteries and worn under your wetsuit, drysuit, or even winter jacket, the Thermalution® will spoil you on a cold day.  Whether you are in the water surfing, diving, kayaking, or kiteboarding or on dry land hunting, fishing, or snowboarding, this suit will change the way you feel about going out on a brisk winter day. 

Thermalution® is by far the best heated wetsuit product available on the market!  It has the smallest battery size of all heated wetsuit products, and with a weight of only 1.5lbs, it is worn virtually unoticed beneath your wetsuit or drysuit.  Of all heated wetsuit products currently available, Thermalution® has the capacity to heat up in the shortest amount of time (under a minute), while been able to last for the longest duration (maximum 150 minutes per use).  With three levels of adjustable heat,you can adjust the temperature of the thermal layer within your wetsuit, up to 75ft beneath the surface, giving you absolute control of the amount of warmth in your suit.  
Thermalution® uses Far Infrared Ray technology, which doesn't just heat your skin like many other products.  Thermalution® actually heats deep within your core, giving you improved blood circulation, enhanced cell and tissue regeneration, pain relief, and comfort to the entire body.  You will be amazed at how much more comfortable you will feel after turning on the suit to even only the lowest of three settings.  Once you have a session in a Thermalution, you won't ever want to venture out on a winter day without one!


Similar to any base layer clothing (like Under Armor®) Thermalution Undersuits can be worn beneath any wetsuit, dry suit, or jacket. It's most effective to wear directly on your skin.

Wearing beneath a wetsuit

Thermal protection of a wetsuit is limited to insulate your body and minimize heat loss. The thicker the neoprene, the warmer you'll feel, but you may get extremely exhausted by putting a thick wetsuit on. With our Thermalution® Power Heated Undersuit, you can say good-bye to a thick wetsuit and enjoy a fun cold water sport with a thinner wetsuit, because Thermlation generates heat instead of only been able to reduce heat loss. By wearing Thermalution® Power Heated Undersuit beneath your wetsuit it distributes the heat through whole body by the water underneath your wetsuit.

Battery and Controller

Thermalution Heated Undersuits use two 7.4 volt Lithium Polymer batteries. Battery Size: 4x2x0.5 Inches.

These are the same type of batteries found in your mobile phone or mp3 player. There is no danger of radiation, electric shock or explosion from these batteries. Batteries are compact and lightweight and are positioned outside of the undersuit at the sides of the chest, under the arms. It offers maximum freedom of movement and it's easy to change batteries.

Thermalution micro controllers are easy to use. To turn on the undersuit push and hold button for 2 sec. On start up it displays a green light and starts temperature on low. Push once more to change to medium temperature with an orange light indication and once more to change to high with a red light indication. To turn the undersuit off simply push and hold button for 2 sec.

Product Reviews

Write your own product review

Showing reviews 1-10 of 37 | Next

  1. Cannot without anymore...

    Posted by Unknown on 11th Mar 2014

    During our winter, we wouldn't wanna go into the water without it anymore. Really helps staying warm, thus allowing to reduce the wetsuit thickness. Long lasting battery power, easy and fast to charge. It'd be even nicer with the heating patch extending further down. Sometimes trouble with the controller after getting wet - very difficult to change levels. All in all, very satisfied with the gear and great service. Thanks guys.

  2. Simply a most for winter water kiting!

    Posted by Unknown on 7th Feb 2014

    I live on Hatteras Island and kite the Real Slick all winter. At first I was using a drysuit in the really cold weather (sub-50) but I found water was always getting in someplace and my feet and legs would get cold after about a half hour. Then I bought the Thermalution Surf Series (15M) and started using it under my 4/3 wetsuit. What a difference. Normally I could use this wetsuit down to about 50. With the heated vest I've had it on in 25mph winds with the air in the very low 40's and I feel like it's early fall! Literally, I get off the water when I get tired not cold! Not only am I warm but I'm kiting better too, simply because I don't fear the big chill of a flush.
    I'm planning on using this vest for surfing too.
    I pretty much stopped for the winter once the ocean got below 60 but I'm pretty sure I could be out there now (with the waters in the 40's with this vest.

  3. toasty sessions

    Posted by Joaquin Sherman on 27th Jan 2014

    I used my heated rashy for the first time the other day. I is toasty warm. It did leave a perfect red outline of the heating elements on my back for like 4 hours. It itched for a couple hours and was gone by the morning. I think it was from turning on my shirt on low under my dry wetsuit for a pre session warm up. No harm done, just wondering if that's normal. I think you guys could improve the design greatly, if you continue the heating elements lower down to the S1/ L5 disc area. I noticed my lower back problem zone could use direct heat. It would be nice if the elements wrapped around to the lower back and stopped at the "love handle" area.
    All together, it's awesome!

  4. Changes winter surfing completely. Its an amazing feeling to be warm in the winter surf!

    Posted by Brian on 15th Jan 2014

    Wore this for the first time after Christmas - water temp around 42 degrees - air temp in the 30s and windy. I wore my 4/3 hooded wetsuit (instead of my full winter 6/4 suit) with the thermalution on low and I was nice and toasty. My friend was all bundled in his 6/4 suit, no thermalution, and he was cold. Even on low power, it is such a great feeling to have some heat hit you in the cold water. Like another reviewer said, never will the cold deter me from surfing again in the winter. Awesome product.

  5. Great Way to help stay warm in the cold water.

    Posted by Unknown on 13th Jan 2014

    Wow, what a difference it makes to have a heated shirt on under your wetsuit. This is the cats meow. I only gave it 4 stars though because one of the coils quit on me. Not a problem in the end. Warranty Baby!!
    Hey, It's worth a shot if you can afford it. Life is good.

  6. Great invention! Takes the chill off

    Posted by Drew B. on 6th Jan 2014

    I was hesitant about the price. I read all the reviews and this product was rated the best. For me it comes down to this, I didn't like being cold during the winter months, this heated rash guard keeps me warm resulting in me surfing more often even when the waves aren't firing just cause coldness isn't a factor. When it is firing, I turn the rash guard on during the lulls. Bottom line, I surf more during winter because of this heated rash guard. Well worth the cash$$.

  7. hey it works !!

    Posted by glenn on 2nd Jan 2014

    just used my thermalution vest for the first time and wow it works great ! the air temps were in the mid 30s and the water temps were in the low 40s .tried the low setting and I was toasty for over 2 hours ! just wondering how cold it has to be to try the medium or the high setting ? so far so good .

  8. Low 20s*F Air and Low 30s*F Water Temps

    Posted by Thunnus Longfinicus on 20th Dec 2013

    The headlines says it all- it is cold up in here in MA.
    And yes, this another recommendation for the HWS. It is money well spent. I’d also recommend silicone ear plugs and beach cooler filled with blazing hot water. Use these tools with good wetsuit gear and you’ll be styling all the way through winter.

  9. Great service

    Posted by Box on 16th Dec 2013

    So I'm reviewing on the service here because I bought the Thermalution Heated Undersuit (15M) for a Christmas gift; it's wrapped under the tree.

    It arrived not only super fast but packaged in a box that said "Economy Tampons" as per my request. Hey, I asked and they delivered and my bf has nooooo idea what really arrived on the porch as he avoided touching the box when he got home. Ha!

  10. Plenty of battery and heat, but not in right place

    Posted by Unknown on 18th Nov 2013

    The larger coil should be in the arch of the back. That is the pivot point for all movement, it is in the Kidney area and its where you are most likely to been collecting water, especially if you are on a short board. Warming the shoulders is not a core warming.

Showing reviews 1-10 of 37 | Next

Product Videos

Heated Wetsuits - Thermalution Battery Heated Rash Guard 15m (01:13)
Thermalution's Heated Rash Guard or Vest is the warmest heated wetsuit product in the world. Used kayaking, surfing, kiteboarding, or any other water sport, this is the most advanced way to stay warm in your wetsuit or dry-suit. The 70M model is a almost identical heated rash guard that is waterproof to 200ft, helping scuba divers and free divers stay warm underwater.Here is a quick video showing the basics to the Thermalution 15M model. Found at http://www.heatedwetsuits.com
  • Heated Wetsuits - Thermalution Battery Heated Rash Guard 15m
    Thermalution's Heated Rash Guard or Vest is the warmest heated...

Warranty Information

We offer a Full One Year Warranty on all Thermalution Heated Wetsuit Products purchased directly through HeatedWetsuits.Com.  This covers all heating elements, stitching, and battery power components. 
Petatech International Company, Ltd (Makers of Thermalution) offer a 12-month Limited Manufacturer's Warranty from the date of purchase from any retailer worldwide.  This warranty covers any Defective Materials or Components and Faulty Workmanship for one year.  Thermalution also offers a 6-month warranty on all batteries and components.  Customers may register their Thermalution products online for a full year manufacturers warranty on the batteries as well.