I've never worn a wetsuit. I swim well without one: approx 1:15/100 yards in a pool. BUT, I'm going to buy one online anyway because I can't stand thinking my main rivals are going to wear one and have that advantage. Our water will be 76 degrees, so warmth isn't the issue. I'm going to get a sleeveless wetsuit...thinking of an Orca. Where do wetsuits chaffe/rub? When I swim, the top of my deltoid frequently scrapes against my jawline--do I need to get a wetsuit with a thin strap that goes over the shoulder or should the "sleeve" cover the top of my deltoid (shoulder)? Having asked about the pro's and con's of wetsuit in several ways, I'm convinced I'll at least swim my normal speed if not better. My only fear is that I could gain a 30 second improvent (over 2100 meters) at the expense of painfully chaffed spots and heat exhaustion for the 4 hours of the race after the swim. My race is in 2 weeks, and there's no place in these parts to rent a wetsuit.