Small 51-55cm K2 "Rival Pro" winter sports helmet in a head turning limited edition 2-tone red. Now you can jam to your favorite tunes while going down the slope with this awesome audio helmet with integrated speakers! This is a Unisex Size Small, fully adjustable K2 patented "Dial Fit" system covering measurements 51-55cm, 20 1/2" - 21 5/8", should fit most kids, a lot of teens, and smaller adults, please use the measurements listed to see if the fit is right for you. In-Mold – In-Mold is the premium construction for ultra-lightweight performance helmets and is characterized by an EPS liner that is molded directly to a lightweight polycarbonate shell. The result is a construction so light you'll forget it is even there. Ventilation Passive-Channel Venting – Channels on the inside surface of the EPS direct air flow between your head and the helmet, removing moisture and excess heat, and keeping you dry and comfortable all day long. Fit 360 K2Dialed Fit System – An evolution of the K2Dialed Fit System, the new 360 K2Dialed Fit System delivers unparalleled customization. A web design that is integrated into the textile liner provides maximum comfort and a secure fit. Thanks to more evenly distributed pressure, the all-new 360 K2Dialed Fit System eliminates unwanted pressure points regardless of your head shape. Additional Features Full-Wrap Liner – This full-coverage, washable liner snugly cradles your head, creating the unmatched fit of a K2 helmet. The liner features a crown mesh that wicks moisture and breathes to prevent overheating. There are no gaps, which means a better fit and improved comfort. K2 Level 3 Baseline Audio – The K2 Level 3 Baseline Audio system seamlessly connects you with your cell phone or media player. The audio system comes pre-installed in Baseline Audio Earpads. The speaker housing creates a minimal, low-profile stowage so you won't notice the speakers unless the music is playing. If you would rather ride without the speakers installed, they c