Okay so I've been doing triathlons for a good few years but only 1-3 a year and normally sprints, this year I've upped and I'm doing my first 70.3 (Ironman Wales calls in 2014 .. already entered!) in 2 weeks..however I'm in a dilemma. The weather has suddenly turned so if it stays like this it is going to be flipping freezing riding on the bike in just a sleeveless tri suit ... and surely putting arm warmers on is just stupid!? What would you wear? do you wear anything under your tri suit? I was considering something like a 2XU compression SS underneath but will this actually dry quickly too or what? I'm guessing so as designed to wick away sweat?