The Pearl Izumi Merino Base Layer will give you warmth and comfort when you need it most. Made from Transfer Merino fabric that combines wool and recycled polyester for sustainable technical performance. Pearl Izumi has a unique plated fabric construction that places polyester next to your skin and merino on the exterior for excellent moisture transfer and thermal regulation. This means that this base layer is warm and snug" yet still breathes for comfort that you'll love on every winter ride.