, The Womens Thermo-X Long Sleeve Crew is part of Oneills base layer insulation range that provides incredible insulation with low bulk and quick dry properties. The Thermo-X fabric is 220g Nylon/ Spandex with DWR (Durable Water Repellent) Coating. Further features include 4-Way stretch, a Boardshort Connector, Rash Protection and Flatloc Stitched (breathable seams). , Features, Thermo-X 220g Nylon/ Spandex with DWR Coating, 4-Way stretch, Boardshort Connector, Rash Protection, Flatloc Stitched, , ,