Imported lace-up closure SHOE SIZE: D = Medium width THIS SHOE IS FOR: This is the sister shoe to the Launch, so it works as a great long-distance racing or training shoe for efficient runners with added support to help non-neutral runners. ENERGIZED FEEL: Delivers a responsive and springy ride to add extra lift to your stride without compromising support or speed. GUIDERAIL SUPPORT SYSTEM: Next-generation GuideRails provide holistic support by guiding your feet into alignment??reducing heel and shin rotation, and keeping excess knee motion in check. LIGHTWEIGHT FIT: The one-piece mesh upper and internal bootie are so light and breezy, they feel like they??re not even there.