Acavati Pro Stretch Men's Rash Guard 850 Series -Surfing Rashguard PERFORMANCE FIT  This is our 850 Performance Series Rash Guard. "Compression Fit + High Stretch = Best Performance" That means a tighter compression fit, but will loosen in the water and over time. Size up  size (1 at the most) size if you are looking for something a little looser, but remember that as rash guards get wet they will feel looser. Also over time they will wear in and loosen. Remember to machine wash, but hang dry. ULTRA STRETCH - Fabric is a high stretch fabric to allow for natural movements in the water while helping to stay in place. *Note that this model (850 Series) does not have the board short connector. Some of our models do, but not this one. HIGH TECH FABRIC  High tech stretch fabric and stronger than most rash guards so it holds up over time. It is also UV50+ rated to protect you from the sun. It is also water repellent and allows for low water absorption for a lighter weight and faster drying. Designed to stay comfortable all day. FOR SURFERS by SURFERS  All Acavati gear was Designed by True Waterman. Surfers and Stand up Paddle boarders who have spent their whole lives in the water. Our gear designed to stand up to long hours in the water and perform better. GUARANTEED  Acavati gear is built to stand up to the task.