http://www.ironman.com/triathlon/ev...and-regulations/swim-rules.aspx#ixzz2ZDzhkpYU
What are the wetsuit restrictions?
- Wetsuits cannot measure more than 5 mm thick.
-Wetsuits are permitted if the water temperature is up to (and including) 76.1 degrees Fahrenheit (24.5 degrees Celsius) or colder.
-Wetsuits will be prohibited in water temperatures greater than 83.8 degrees Fahrenheit (28.8 degrees Celsius).
-Athletes who choose to wear a wetsuit in water temperatures between 76.1 degrees Fahrenheit (24.5 degrees Celsius) and 83.8 degrees Fahrenheit (28.8 degrees Celsius) will not be eligible for Age Group awards, including IRONMAN World Championship slots or Rolldown slots.
-Full wetsuits are permitted (arms and legs covered).
-The De Soto Water Rover wetsuit is PROHIBITED
*NOTE: ANY ATHLETE ELECTING NOT TO RACE MUST NOTIFY TIMING IMMEDIATELY. ABOVE ALL, THE SAFETY OF EACH SWIMMER IS OUR PRIME CONCERN. A FULL SWEEP OF THE COURSE WILL BE MADE DIRECTLY BEHIND THE LAST SWIMMER. VISUAL AID WILL BE PROVIDED BY THE LIFEGUARDS, DIVERS, CANOES, AND KAYAKS, BUOYS AND AQUATIC CRAFTS THAT LINE THE COURSE.