It also syncs with any ANT+ HRM

low-friction textile lace adapted to many fit configurations

which offers a large adjustment range to provide a secure fit for growing kids

21 mm width

Not all feet are the same

Smith 4D MAG S Photochromic Goggles 2027 Color:Black | ChromaPop Pro Photochromic Blue Mirror It also syncs with anyScope your line. Read the terrain. Drop in with confidence. The SMITH 4D MAG S goggles bring the wide field of view and crisp optics of the 4D MAG to goggles designed for smaller faces. Add our quick and easy magnetic lens change tech, and youve got the only goggles you need for all conditions riding. Thanks to ChromaPop, the 4D MAG S drops you into a bigger, brighter, sharper world. VISION SMITH MAG technology allows for quick & easy lens changes