A wetsuit is compulsory and it is your responsibility to ensure you have one on race day. The wetsuit will not only keep you warm, but will also help you swim faster as it provides you with extra buoyancy.
Wetsuits must be worn up to 25°C. Should the water temperature exceed 25°C wetsuits are not permitted and changes to the event may be made at the organisers discretion.
Surf and shortie wetsuits are allowed, but these are totally different to a triathlon specific wetsuit, which is designed for swimming and fits like a second skin.