It depends on water temp. Here's the USAT rule on wetsuits:
Each age group participant shall be permitted to wear a wet suit without penalty in any event sanctioned by USA Triathlon up to and including a water temperature of 78 degrees Fahrenheit. When the water temperature is greater than 78 degrees, but less than 84 degrees Fahrenheit, age group participants may wear a wet suit at their own discretion, provided however that participants who wear a wet suit within this temperature range shall not be eligible for prizes or awards. Age group participants shall not wear wet suits in water temperatures equal to or greater than 84 degrees Fahrenheit.
Regardless of whether or not you can use it in the actual race, it might be something to think about in your training to help you feel more secure and get more comfortable in open water. Then work on swimming in open water without it.




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