Rash Guards: UV Protection & Chafe Prevention for Water Sports

A rash guard (rashie) is a form-fitting athletic shirt made from UPF-rated stretch fabric (nylon/spandex or polyester/spandex blends) worn for water and land sports.

Primary Functions

• UV Protection: UPF 50+ blocks ≥98% UVA/UVB; reduces sunscreen need on covered areas.
• Abrasion Resistance: Prevents board rash, wax irritation, jellyfish stings, coral scrapes.
• Thermal Layer: Thin neoprene (0.5–1.5 mm) or fleece-lined for cool water.
• Muscle Compression: May reduce vibration fatigue; modest performance benefit.

Design Features

• Flatlock stitching → minimal chafing.
• Raglan sleeves → unrestricted shoulder ROM.
• Boardshort connector loop → prevents ride-up.
• Mesh panels (axilla, back) → ventilation.
• Long-sleeve vs. short-sleeve vs. vest styles.

Selection Guide

Activity	Recommended Weight	Key Feature
Surfing / Bodyboarding	Standard (180–220 gsm)	Durability, boardshort loop
Swimming / Triathlon	Lightweight (130–160 gsm)	Hydrodynamics, quick-dry
Diving / Cool Water	Thermal (0.5–1 mm neoprene)	Insulation
Paddle Sports / Sailing	Standard + UPF 50+	Sun protection, mobility

Care

• Rinse fresh water after each use.
• Hand wash mild detergent; air dry shade.
• Avoid dryer, bleach, fabric softener (degrades elastane/UPF).

Rash guards are not life jackets; they provide no buoyancy.