The Smith Prospect Jr. MIPS Helmet features the latest in protective technology PLUS the ability to adjust to a huge range of head sizes so your young ripper can keep the same helmet for many seasons. The Smith Grow With Me sizing system uses a dual stage liner strategy to accommodate the largest range of head sizes in the industry, and comes with both MIPS rotational protection and Aerocore protection. Any one of these features is enough to warrant buying this helmet, but with the Prospect Jr. MIPS you get them all.