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Without unnecessary brand name dropping, what current technology blows you away?
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I know the OP requested no brands, but would like to know what these are called?
How hot and how cold.
It's the Therabody RecoveryTherm Cube, and it get's hot and cold enough on the highest setting it feels intense enough you can't comfortably use it directly on skin. That said it's not as cold as an ice pack, but I don't think that's the intended use.
It has 3 modes, here are the temps from the manual: