Burton's '[ak]' line is inspired by the unpredictable conditions in Alaska and continues to set the bar for high-performance snowboarding gear. - This 'Helium' half-zip style is ideal as a base- or mid-layer - Polartec® Power Grid™ fleece is light and insulating, so it reduces bulk beneath your jacket - Moisture-wicking properties keep you comfortable, while softlock seams prevent chafing