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.