O'Neill Wetsuits - O'Neill Thermo-X Short Sleeve Crew Thermal Rashvest - Black :: Men > Rash Vests. Polypro Material: Provides excellent insulation in a minimal bulk fabricUV Protection: UPF 50+Performance Fit: Tighter construction across the abdomen and shoulders\n for a second skin feelSuper Low Crew Neck: Means no interference with wetsuit neckDurable Water Resistant Coating: For maximum insulation and water wicking\n propertiesFlatloc Stitched Seams: Breathable and comfortable constructionStrategic Seamless Paddle Zones: 4 way stretch with anatomically shaped\n panels for more efficient movementQuick Dry: Yes Size: X-Large,XX-Large,Medium,Small.