Every detail has been thought to keep weight at a minimum without compromising the structural and protective features fundamental for racing. The structure of the uppers is created using a lightweight, high frequency frame with a soft, breathable and comfortable EVA net. Maximum care and attention has been given to flexibility, to promote natural foot movement without constricting the front flex zones. Helios SR uses a snug fitting Slip-on construction upper for ease of use. The injected midsole with Morpho Dynamic technology works in synergy with the FriXion XT dual density sole, to provide optimal shock absorption. Features such as the reflective inserts, the reinforcement zones on the toe and heel in micro fibre and the internal protective silk screening, have been created to satisfy the most demanding off-road runners. Helios SR takes minimalism to the racetracks.