I need to get a new bike helmet for doing my first ironman, so looking for any pointers. Couple of things to consider, firstly I sweat a lot so staying cool is quite important. Secondly I am not at pointy end and looking to gain every single second of advantage (So the ones that make you look like a dick - my wife's observation I should say, not on my shopping list). Whilst willing to pay a bit, not stupid money as already done that on a bike. Any thoughts, experiences and recommendations welcome. Thanks Tom