The field and the equipment

Measurements and equipment: what officials check, rarely what decides a match.

Officials' detail · 2 rules · Step 4 of 4

The competition

How is an open water race timed?Each swimmer wears a microchip transponder on each wrist.
What may an open water swimmer wear and carry?A swimmer may use an approved swimsuit, goggles, up to two caps, a nose clip and earplugs.

All Marathon swimming rules rules