Loaded with toasty Thermacore insulation, the Burton Boys' Phase Jacket delivers fiery warmth when your kid's mastering skills on the mountain. The DryRide Durashell 2 layer membrane provides high levels of water repellency. That means he'll stay nice and dry through deep powder dumps and wet springtime slush. Another ride friendly feature is the mesh lined underarm vents. These vents prevent overheating during active use, especially on those warmer spring days. And to keep up with fast growing kids, the jacket's ingeniously designed with Burton's Room To Grow, meaning it'll expand one full size along the sleeves. Simply roll up the sleeve cuffs and snip the red thread. Viola! The jacket's sleeves are now a full size larger, extending its use through another winter season.