Sidewalk, pump track or trail, inspire your little ripper with some big kid style. The Smith Sidekick Jr. Mountain Bike Helmet packs classic MTB style and Mips® Safety System crash protection into a helmet for the youngest dirt riders. From the visor to the vents and extended back coverage, it has all the design features of the big kid helmets. The right fit is key, so it's available in two sizes and includes our dial-adjustable system to fine tune fit and comfort.