A rush guard, also commonly known as a rash vest or rashie, is a close-fitting athletic top designed primarily for water sports. It serves as a protective layer between the wearer's skin and the external environment.

1. Abrasion Protection: The original and most crucial function of a rush guard is to prevent "rashes" or skin irritation caused by friction. This is essential in sports like:
   • Surfing: Protects the chest and stomach from rubbing against the waxed surface of the surfboard.
   • SCUBA Diving/Snorkeling: Shields the skin from accidental scrapes against corals, rocks, or the boat.
   • Kitesurfing/Windsurfing: Protects from the harness and board.
   • Other Watersports: Also popular in swimming, triathlons, and stand-up paddleboarding.
2. Sun Protection: Modern rush guards are almost always made with fabrics that offer high Ultraviolet Protection Factor (UPF). A typical UPF 50+ rated rush guard blocks over 98% of the sun's harmful UV rays, making it a highly effective alternative to sunscreen for large areas of the body.
3. Thermal Insulation: While not as thick as a wetsuit, a rush guard provides a thin layer of insulation, helping to retain body heat in cooler water and air. It can be worn alone in warm conditions or underneath a wetsuit for extra warmth in colder climates.
4. Sting Protection: In certain waters, a rush guard can offer a minor degree of protection against jellyfish stings and other minor aquatic irritants.

• Primary Fabric: Rush guards are predominantly made from Nylon, Spandex (Lycra), or a blend of both. The combination provides:
  • Nylon: Offers durability, quick-drying properties, and resistance to chlorine and saltwater.
  • Spandex/Lycra: Provides the essential 4-way stretch for a snug, flexible, and non-restrictive fit. It allows for a full range of motion during athletic activity.
• Common Features:
  • Flatlock Stitching: This type of seam lies flat against the skin to prevent chafing and irritation.
  • UPF Rating: As mentioned, a high UPF rating (50+) is standard for reliable sun protection.
  • Anti-Microbial Treatment: Many high-quality rush guards are treated to resist odor-causing bacteria, keeping the garment fresher for longer.
  • Raglan Sleeves: Sleeves that extend to the collar (common in baseball shirts) allow for greater arm movement.

In summary, the rush guard is a versatile and essential piece of gear for any water enthusiast. It seamlessly combines protection from abrasion, the sun, and cool temperatures with the flexibility and comfort needed for high-performance activities.