Removable Insole - With a new midsole construction, the Nike® FS Lite Run 3 running shoe keeps you comfortable and light on your feet during a run. The new co-molded midsole utilizes two densities of foam material to increase responsiveness. The dual upper layers are fused together with a heat process instead of glue to make the shoe lighter and more durable. Breath Tech construction ensures midfoot support, while the rubber outsole pods increase traction.