NRS Disco Surf Shirt is an excellent garment for cool wet days. Raw neoprene front and back eliminates evaporative cooling. HydroSkin with a cropped fleece inner stays warm and stretchy and Spandex at the arm pits and neck adds comfort.1-mm raw neoprene stretches to match your every move while shedding water to prevent evaporative cooling. Fleecy ThermalPlush lining adds warmth and next-to-skin comfort. Flatlock stitching for durable, comfortable seams. 0.5-mm HydroSkin panels with nylon facing add comfort and mobility in key zones. Spandex panels under the arms and below the chin help prevent chafing. Chest-XS- 28-32 SM- 32-36 MD-36-40 LG- 39-43 XL- 42-46 XXL-46-50.