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.

Front and back heating!
The first front and back heating undersuit. With a separate front heating belt, it allow you to hit different body shape by adjust it easily.

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 Plus

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.


Put the Front heat belt around your lower abdomen, make sure the heating zone is right in the place where you want to be warmed. Connect the Red connector to the other end on the undersuit also with Red connector.


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

Blue Grade Plus+ - Size Chart - PSD10-AI
Chest Abdomen  
Size Chest - inch Chest - cm
XS 29.5" - 33" 76 cm - 85 cm
With Front Heating Belt S
Abdomen : 23.5" - 36.5" / 60 cm - 93 cm
S 33" - 36.5" 85 cm - 92.7 cm
With Front Heating Belt S
Abdomen : 23.5" - 36.5" / 60 cm - 93 cm
M 36.5" - 40" 92.7 cm - 102 cm
With Front Heating Belt M
Abdomen : 31" - 41" / 78 cm - 105 cm
L 40" - 43.5" 102 cm - 111 cm
With Front Heating Belt M ( including Extender )
Abdomen : 31" - 49" / 78 cm - 125 cm
XL 43.5" - 46.75" 111 cm - 118.8 cm
With Front Heating Belt L ( including Extender )
Abdomen : 34" - 55" / 87 cm - 140 cm
XXL 46.75" - 50" 118.8 cm - 127 cm
With Front Heating Belt L ( including Extender )
Abdomen : 34" - 55" / 87 cm - 140 cm
Error value: ± 1 cm / 0.4 inch
For Undersuit : 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.
For Front Heatint Belt : If length of belt needs to be extended, please advise in advance and remark it on your order.

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 :
Surf Series Green Grade Plus + Blue Grade Compact Dive Series
Yellow Grade Plus + Red Grade Plus + Red Grade Ultra