Insoles are removable inserts placed inside shoes to provide additional comfort, support, and cushioning for the feet. They can help improve the fit of shoes and reduce fatigue during prolonged walking or standing. Insoles come in various materials, including foam, gel, and rubber, and can be designed for specific purposes, such as sports or everyday use. Many people use insoles to address foot issues like plantar fasciitis or flat feet. Custom insoles, often made by podiatrists, can be tailored to an individual's foot shape and needs. Over-the-counter options are also available in stores, catering to different foot types and activities.