Through the heat of the body, the sole molds to the foot and distributes the pressure. After taking off your shoe, the sole returns to its original state. These soles provide optimal comfort. 

• Material: 100% polyester 
• Insoles made of polyester
• Body heat ensures that the sole molds itself to the foot
• Provides optimal comfort 

Ok so I sort of scoffed at these at first but thought what the heck. So tried a pair myself because my paddock boots were hurting my feet. At first it felt like there was too much in my shoe but after awhile I stopped noticing and my feet stopped hurting. I guess I am a believer now.