The Alpha Core SL Base Layer stands out for its exceptional warmth-to-weight ratio and its ability to resist wet weather. It's crafted with Polartec Alpha-Direct insulation, which retains warmth even when wet. This breathable, recycled fabric is strategically placed in three-quarters of the front and back panels to ensure core insulation.

Continental mesh is incorporated in the side panels and the bottom quarter of the front and back, providing added stretch and breathability. To complete the design, elastic-bound neck and arm-holes offer a comfortable and flexible fit.