Here's what other sites are saying:
The Mysterioso Nyloprene top offers warmth and protection from the elements while paddling. 0.5mm neoprene fabric insulates, sheds water and feels soft against skin. Side panels, sleeves and collar feature moisture-wicking Polartec® Power Stretch® fabric. Quick-drying, breathable Power Stretch is constructed with an abrasion-resistant nylon and spandex outer surface and soft, velour-finish fleece inside. Raglan sleeves allow freedom of movement. Flatlock stitching prevents chafing. Treated to resist growth of odor-causing bacteria. Hand wash in cold water and line dry.
- REI refers to the men's version