Much more than a rashguard: the O'Neill Thinskins Superlite Short Sleeve Crew Top has the same high-quality neoprene (Ultraflex DS) as in many of their top wetsuits, while the arms are Lycra for maximum mobility.If you have a Thinskins Superlite S/S Crew Top on, then you can rest assured the sun, nor that blasted windchill will penetrate wherever it lies.