Spenco Propel + Carbon Performance Insole drymax Flat-knit design reduces bulk for

Flat-knit design reduces bulk for a better fit in shoes

Lightweight

Double-layer design helps prevent blisters by reducing friction

this sock delivers race-proven protection even in the harshest conditions

Spenco Propel + Carbon Performance Insole drymax Flat-knit design reduces bulk forSpenco Propel + Carbon Performance Insoles deliver explosiveness with each foot strike. Turn your everyday trainer into an elite race ready shoe with the Spenco Propel + Carbon insole. Designed by biomechanical experts, this insole features a carbon plate for explosiveness with each foot strike and INergy Foam for next level energy efficiency. Features Carbon Plate provides forward propulsion and explosiveness with each foot strike Responsive INergy