Tesla DRST TM-T71-NVBZ_Small Surfista Men's UPF 50+ Long Sleeve Crew Athletic Fit Rashguard T71 Atheletic Fit, we strongly recommend choosing ONE size up. Tesla's original Rashguard lineup designed specifically for water sports and Surfing UV Protection Factor 50+ Durable high-density fabric that protects against rashes, abrasions, and harmful UV Rays. Twisted 3-D patterns along with pristine detail design and flat-lock stitching