Asics Lethal Speed ST Rugby Boots. Take to the field in these Asics Lethal Speed ST rugby boots which features a 10mm heel that improves acceleration. Upper Made with a one piece synthetic leather upper and providing a specific wide fitting last for rugby, the Asics lethal speed is perfect for aiming for the middle of the uprights or kicking for touch. Midsole Featuring Hg10mm technology which firstly gives performance enhancement which increase running and dash efficiency and secondly ensures injury prevention as it puts less strain on the lower limbs. Hg10mm heel gradient shifts the body mass forward over the centre allowing a faster transition from standstill to action with substantially less strain on the lower limbs. Board lasting has been implemented in the Asics Lethal Speed ST rugby boots: the upper is glued to a thin fibre board, then cemented to the midsole, allowing for superior stability and durability. Also featuring Solyte technology which is an even lighter midsole than the Speva without loosing all it's other properties. Some of the benefits of using this technology would be that it provides cushioning, durability, responsiveness and of course, its lightweight. Outsole The Lethal Speed ST rugby boots uses a traditional, round stud, moulded injection PU outsole. Choose your stud length with removable studs.