Endorphin Speed 4 Energy-efficient competition and interval shoes. SPEEDROLL technology with curved underfoot with a focus on kick-off and propulsion. Sensitive upper with lightweight seamless mesh for optimal fit. Midsole with light and responsive foam, PWRRUN PB. S-shaped nylon plate with wing construction in the midsole for responsive step development. The Endorphin Speed 4 is an energy-efficient interval and competition shoe with a good response and running feel. Thanks to the SPEEDROLL technology, continuous propulsion is created that generates more speed with less energy loss. In this way, an interaction is created between the runner and the shoe, where the runner comes to the step progression more quickly and rolls through the step with lower energy consumption. This puts less strain on the feet, heel tendons and calves. You get a "faster running feeling", the hip is in a higher position and the body is in a more forward-driven position. This year's shoe is based on its predecessor but has been updated in the upper and has a somewhat stiffer nylon plate. This gives somewhat better response and basic stability than its predecessor. The upper part has been updated with thinner seamless mesh for good support in the midfoot. This provides a comfortable, tight and individual fit. The shoe also has good step-in comfort with a new insole with Super Critical Foam. A foam that is a mixture of "super foam" and EVA. Durable outsole where needed. The Endorphin Speed 4 is a pace/competition shoe for those who want the very best conditions for setting new records. Category: Competition (Neutral) Upper: Engineered mesh Insole: Super Critical Foam Shock absorption: PWRRUN PB midsole (PEBA-based) Outsole: Carbon wear sole, XT900 Other functions: S-curved hard plastic plate, SPEEDROLL technology Drop 8mm (Heel: 36 mm / Forefoot: 28 mm) Weight women 206g us8 / men 233g us9