In their shoes, On Running uses three types of foams, namely: 1) Helion Super Foam, which is present in most On shoes, along with good cushioning and energy return; 2) Zero Gravity Foam, thicker, denser, and providing more stability with less bounce; 3) Helion HF (Hyper Foam) - a more bouncy and lighter version of Helion Super Foam, found in On running shoes that are very light and fast.