When it comes to the bellicon, Hines notes that it can be used with bare feet, socks, or shoes. For added benefits, bouncing in bare feet or with socks can engage the feet, ankles, and lower legs more than when wearing sneakers. “However, for people with supination or pronation issues of the feet, or for people who want a little more stability on the pliable mat surface, shoes might be preferred,” says Hines.