Burton [ak] Helium Grid Fleece Half-Zip The 2027 Burton [ak] Helium Grid Fleece Half-Zip is a breathable midlayer built for high-output days from splitboard tours to cool-weather hikes. Its midweight grid fleece combines warmth and airflow, while stretch construction and a slim fit keep movement easy without adding unnecessary bulk under a shell. HeiQ Smart Temp and HeiQ Fresh help regulate comfort and manage odor through long days of activity. Lightweight and versatile, it works as a stand-alone layer on the climb or as added warmth when conditions cool down. Details Material: 94% recycled polyester / 6% spandex midweight flat-face grid fleece Fit: Slim fit with hip-length coverage Weight: 225 GSM midweight grid fleece Breathability: Grid fleece construction promotes airflow and quick-drying performance during high-output activity Technology: HeiQ Smart Temp for temperature regulation and HeiQ Fresh for odor control Pockets: Zippered back pocket for low-profile storage Features: Center front half-zip, stretch thumb loops, chafe-free Softlock seams, double-needle stitching, and YKKA(R) zippers Sustainability: Recycled polyester and bluesignA(R) approved materials