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Rash Guard — What It Is and Why It Matters

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A rash guard is a lightweight, quick-drying shirt made from lycra, spandex, or similar synthetic material worn under a wetsuit or as standalone sun and abrasion protection in warm tropical water. It prevents chafing from wetsuit neoprene, provides UV protection, and offers minimal thermal insulation.

In very warm water (above 28°C / 82°F), many divers wear only a rash guard without a wetsuit. Long-sleeve rash guards offer additional protection against jellyfish stings, coral scrapes, and sunburn during surface intervals.

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Frequently Asked Questions

Can I dive in just a rash guard?
Yes, in water above 27 to 28°C (80 to 82°F) and for shallow, short dives. For deeper or longer dives, even warm water pulls heat from your body faster than air, so a thin wetsuit (1 to 3mm) is usually more comfortable.
Does a rash guard protect against jellyfish?
It provides a physical barrier that can prevent or reduce stings from many jellyfish species, though it is not a guarantee against all types. Coverage is the key factor — long sleeves and full-length bottoms offer more protection.
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