This shoe just wants to go fast. PHANTASM is a running shoe conceived to propel you forwards and gifted with our most responsive technologies. Featuring Energy Blade for a snappy toe-off and strong propulsion, tag-teamed with Energy Surge foam and R.Camber for a smooth and responsive transition. Easy Propulsion Energy Blade-powered propulsion for snappy toe-off and an easier, more fluid stride. Fast Transition Our signature rocker geometry, R.Camber, ensures a quicker transition – so you spend less time on the ground, and more time moving forward. Smooth Impact Energy Surge is a lightweight, springy and resilient foam compound that powers your stride forward.