On Thursday we stopped for coffee in Claremont. It was served in these cups. At first I thought it might be a new paper cup design but it was too sturdy. The fins made it cool to the touch. I looked up the brand and discovered this:

Our journey began with the iconic HuskeeCup. A modular, reusable cup for the home, cafe, or takeaway that repurposes waste coffee husk, a by-product from the production of coffee.
Huskee US