Spenco Propel + Carbon Performance Insole size-x-large-womens-13-14-5-mens-12-13-5 Double-layer construction reduces friction and

Double-layer construction reduces friction and helps prevent blisters

Ergonomic ribbed fit offers support and prevents slipping

It’s a high-performance Merino sock that keeps feet warm

Drynamix® and friction-free yarns minimize chafing and rub points

Spenco Propel + Carbon Performance Insole size-x-large-womens-13-14-5-mens-12-13-5 Double-layer construction reduces friction andSpenco 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