Water Sport Series


Thermalution® Yellow Grade series is the first power heated undersuit with to endorse the ground breaking heating technology with a rechargeable wireless control system. They are advanced models for longer, deeper dives. The innovation on Yellow Grade 2.0 is from feedbacks and demands of Thermalution® users to meet diveres needs and desire.

Adjustable battery pockets make movement more comfortable.

1.0mm Neoprene with velcro plush makes no press on aside.

Thinner and lighter batteries make movement more accessible. Same heating hours but samller batteries!

With zipper make more space to take thermalution undersuit off.

100m / 300ft deep -100m / 300ft
Suitable for depths up to 100m (300ft) deep. You can wear the Thermalution® Yellow Grade under your dry suit or wetsuit.
Wireless Controller Wireless Controller
Wireless temperature micro-controller with on/off switch and 3 temperature settings with lights indication.
Non-metallic heating panel Heating
Non-metallic heating panel positioned on the back to warm up your core area.
battery waterproof Battery
The high capacity lithium polymer battery has been tested under water to be waterproof.

Heating Zone
Icon_Time Battery duration may vary due to the temperature Sensor activities.
Continuous power output approximately 180-240 mins.

Just put down to charge up.
Wireless Charging Dock
Rechargeable Wireless remote controller

How to use ...

Push the battery connector through the hole at the bottom of the battery pocket. Place the battery inside the battery pocket. Stick the battery bag to the side of the undersuit.


Connect both connectors, wear the Yellow Grade 2.0 undersuit and affix the strap around your forearm and adjust the controller to a comfortable position.


Push the button upward once to adjust between the temperature settings. When the setting is on, the light will flash and the receiver will vibrate.

Yellow Grade 2.0 - Size Chart
size chart of sleeveless
Error value: ± 1 cm / 0.4 inch
In order to optimize the heating performance of the thermalution, we strongly advise our customers to wear smaller fitted sizes of the thermalution. Please refer to the size chart above to find the recommended size of Thermalution for you.
eg.: *When chest size is 33.4", please chose the XS size. / *When chest size is 107.5cm, please chose the L size.

! Please switch off the remote controller and remove batteries immediately while after diving.
※ In order to avoid signal disconnection under water, please use the wireless remote controller (P/N#SPE005-D) as close as possible to the back receiver of the under suit.

! When the wireless controller's battery is exhausted complately, it may cause the charging circuits to fail and prevent it from being able to charge completely.
In order to avoid this situation, please charge the remote controller after each dive. If this happened and your remote fails to work, please contact your local distributor to seek replacement.

Contact direct sales get quotation, or find your local distributor.
If you have any needs about Thermalution product, please >> contact us.
Thermalution Q & A
For more detailed information please visit our Q&A page.

Attention-Read Manual Read and fully understand operator's manual before using this product. Failure to follow operating instructions and any misuse of Thermalution products will create additional dangers.

Check Thermalution.com for updates and additional information. >> By creating an account you can free to download updated instruction manual for your undersuit! << Contact Thermalution if you have any doubts or difficulty understanding these instructions.

.Other product of Water Sport Series :
Green Grade Plus + Surf Series Blue Grade Red Grade Plus +
Blue Grade Plus + Yellow Grade Plus + Compact Dive Series Red Grade Ultra