Waymann 2mm Vest M - Black. The prAna Waymann 2mm Vest is a high performance spring vest made for warm water (65+F / 18+C). Simple color blocked detail has long lasting style. 2mm hyperstretch neoprene is bonded with recycled poly and spandex at interior and exterior for comfort, and UPF 50+ rated for sun protection. Seams are flatlocked to prevent chafing while also providing durability and flexibility.