Can I use a safety buoy, paddles or fins?

From the official aQuellé Midmar Mile FAQs:

• The only flotation device allowed is a safety swim buoy attached to your torso that floats behind you while you swim. You can bring your own (various brands are sold) or borrow an official event swim-safe buoy, collected as you enter the starting pens and returned shortly after the finish.
• No kick boards or any other flotation device.
• No hand paddles, fins or any other equipment, for safety reasons.