Benefitting from HG10mm technology that raises the heel by 10mm to reduce stress on the lower limb and minimise the risk of potential injury, the Asics Lethal Speed ST is designed for comfort and durability. The new outsole tooling allows for great grip and release during play.Features Include:SOLYTE MIDSOLE - Midsole material lighter than ASICS standard EVA and SpEVA + improve cushioning durability.REARFOOT GEL� CUSHIONING SYSTEM - Attenuates shock during impact phase and allows for a smooth transition to midstance.HG10MM - Shifts body mass forward reducing strain on lower limbs.