The raft must be made of materials which will not harm the environment or cause a danger to other participants. Plastics which could disintegrate, particularly polystyrene, are prohibited. Any material used must be thoroughly cleaned to remove any risk of water contamination.
Any floatation device used must be cleaned internally and sealed. All rafts will be inspected prior to launch and any which do not comply with these requirements will be disqualified and will not be allowed to enter the water.