O'Neill Wetsuits - O'Neill Thermo-X Long Sleeve Crew Thermal Rashvest - Black :: Men > Rash Vests. Strategic Seamless Paddle Zones: 4 way stretch with anatomically shaped panels for more efficient movementDurable Water Resistant Coating: For maximum insulation and water wicking propertiesPerformance Fit: Tighter construction across the abdomen and shoulders for a second skin feelQuick Dry: YesFlatloc Stitched Seams: Breathable and comfortable constructionSuper Low Crew Neck: Means no interference with wetsuit neckPolypro Material: Provides excellent insulation in a minimal bulk fabricUV Protection: UPF 50+ Size: X-Large,Medium,Small.