The Mother of all base layers in the Burton collection is definitely the AK Grid Half Zip. Using Polartec Power Grid Fleece, Burton achieves ultimate breathability and next-to-skin comfort in a fleece that can be worn layered or all on it’s own. The AK Grid Fleece also offers superior wicking power and quick-dry capabilities for Mother Nature’s ever-changing conditions, an articulated fit for more effective layering and a front half-zipper for added comfort and versatility. When it comes to staying warm, dry and comfortable on the mountain, trust the best in the game - the Burton AK Grid Fleece.