The Saucony Endorphin Speed 3 are lightweight and durable running shoes designed specifically for training and competition. They are the successor to the popular Endorphin Speed 2 and offer an improved fit, more stability and an updated upper. The midsole of the Endorphin Speed 3 consists of the innovative PWRRUN PB damping, which offers a responsive running feel and high energy return. The Speedroll design provides a fast rolling movement and thus supports an efficient running style. A nylon plate in the midsole improves stiffness and provides a better forward motion. The upper of the Endorphin Speed 3 is made of a breathable and lightweight mesh material that fits snugly to the foot and offers excellent support. The lacing is asymmetrical, reducing pressure on the top of the foot. Reflective elements provide better visibility in low light conditions. The outsole of the Saucony Endorphin Speed 3 is made from a durable rubber compound and offers high traction on different surfaces. The sole is also durable and resistant to wear and tear. Overall, the Saucony Endorphin Speed 3 are an excellent choice for runners looking for a lightweight yet stable running shoe for training and competition.