What's the difference between gel-infused, shredded foam, and performance cooling pillows?

Gel-infused solid foam pillows have a cool-to-the-touch feel but trap more heat over time. Shredded memory foam allows airflow and is usually adjustable in loft. Performance pillows like Bedgear's Storm line use engineered cover fabrics and internal mesh to actively move heat away, which is why they sit at the premium end of the price range.