Supercharge the cushion in your everyday trainer with Spenco(R) Propel(TM) insoles featuring INergy(TM) Foam technology. Experience a lighter, more durable insole that provides superior energy return versus the standard insole. Fit & Design: 12X Greater Energy Return vs. the stock insole from a leading shoe brand 2X More Durable INergy(TM) Foam for mile after mile cushioning in any shoe 20% Lighter for a lightweight supportive feel while gliding down the road Pack includes 1 pair of insoles