NEMEAN Hydrasilk 2mm TopMaterial: GEOFLEX (90% water impermeable, typically lasts 2 3 years, 1 year warranty and dries in about 3 hours.) Named after the mythical Lion with impenetrable skin that was slayed by Hercules, the 2MM Nemean is a rugged all nylon jacket (i. e. providing an alternative to the all smooth skin Chapter 1 wetsuit Jacket). With the same construction and fit as the Chapter 1, the Nemean provides warmth and flexibility but with increased durability.