Water Sport Series


Thermalution® Blue Grade is the first power heated undersuit which utilizes the Close Proximity Sensor (CPS) control system. It is an intermediate model best suited for divers who wish to dive deeper into the ocean.

The quick fix.
No one enjoys diving while it's cold and miserable. If you are feeling a little blue underwater, why not let the Thermalution Blue Grade fix that? Armed with two lithium polymer batteries, this garment will turn up the heat for up to 120 minutes underwater.

No buttons? I'll tap that.
Introducing the new Close Proximity Sensor control system, the Thermalution Blue Grade can be turned on and off with a simple tap. Avoid having to press clumsy buttons through your gloves with this new simple control system, making your diving experience even smoother.

Thermalution funtion Icon

Thermalution Blue Grade

Heating Zone
Icon_Time Battery duration may vary due to the temperature Sensor activities.
Continuous power output approx max 90-120 mins.

How to use ...

Push the battery connector through the hole of the battery pocket at the bottom. Place the battery inside the battery pocket.


Connect both connectors, wear the Blue Grade undersuit and wrap the strap around your wrist.


Adjust the temperature setting by simply placing the CPS panel next to the CPS controller for 1 second and moving it away.

Blue Grade - Size Chart - PSD10-AI
XS - 29.5"~33" / 75~83.8 cm
S - 33"~36.5" / 83.8~92.7cm
M - 36.5"~40" / 92.7~102cm
L - 40"~43.5" / 102~111cm
XL - 43.5"~46.75" / 111~118.8cm
XXL - 46.75"~50" / 118.8~127cm
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.

Contact direct sales get quotation, or find your local distributor.
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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 :
Surf Series Green Grade Plus + Blue Grade Plus + Compact Dive Series
Yellow Grade Plus + Red Grade Plus + Red Grade Ultra