Remaining true to the originators of the ÖTILLÖ, Casco Bay Islands Swimrun is a two-person team event. Not a relay, teammates race the entire course together. Rules permit swim aids such as hand paddles, pull buoys, wetsuits and even swim fins to name a few. Certain safety gear is mandated by race rules and hydration and race fuel can be carried too, but what one starts with, so too must they finish. Changing from trail shoes to swim fins, or tending to awkward gear can chew up valuable time. Having the right teammate and equipment can make all the difference.