To be clear, the headline refers to yank degrees:

In outdoor tests in Arizona, the textile stayed […] 16 F (8.9 C) cooler than regular silk, a breathable fabric often used for dresses and shirts.

They didn’t really compare it to many materials it seems.

But this is only part of the tale…

• Is it affordable?

• Is it mass manufacturable?

• Is it comfortable?

• Is it durable?

• Is it washable?

• Is it crease prone?

• Can it be easily mixed with other materials, e.g. to make it elasticated?

• Is it recyclable?

• Is it dyeable?

• etc