I've had the orange Klim D30 armor pads in my jackets for over 10 years. I bought two sets over the years = because I'll switch out jackets in the morning depending on the weather.
They remain soft and flexible. My pieces are not as ventilated as are the new pads - but I've never been bothered by heat during my dawn rides

Interesting stuff - got my attention, so I bought them.
"Non-Newtonian Polymer: The core D3O material is a patented, rate-sensitive polymer that is soft and pliable at rest, but hardens on impact to absorb shock "I have hip, knee, shoulder, elbow, back pads - and my ICON boots have some in the ankles.
The boots were the last safety clothing I purchased.
Sneakers will land further away than my body after an impact!
I bought ICONs with the BOA lacing system - now no excuses - much easier to deal with than laces.
Stig