Do You Need to Wear Anything Under a Rash Guard for Your Favorite Activities? Rash guards have become a staple for many activities, from swimming and surfing to beach workouts and martial arts. But one question that often comes up is whether you need to wear anything under a rash guard. With so many different activities and preferences, the answer may vary. Swim and Surf When it comes to swimming and surfing, rash guards are primarily worn for protection against sunburn, rashes, and abrasions from rough surfboards. In these water-based activities, it is not necessary to wear anything under a long sleeve rash guard. Rash guards are designed to be worn directly against the skin, offering a comfortable and skin-tight fit to reduce drag in the water. Beach Workouts For beach workouts such as beach volleyball, yoga, or running, you may choose to wear something underneath your rash guard for added coverage and support. Long sleeve rash guards are soft and breathable, making them comfortabl