Posted: 29/07/2014 at 21:17
I used the Zoot ones in Kona and they were great on the bike and run but as people have mentioned above they can be illegal in some races run by governing bodies for non wetsuit swims regarding anything below the shoulder, sure crowie was disqualified recently for this.
Personally I wouln't wear them in the swim, hot conditions mean your skin needs to sweat, wearing arm coolers for this is a good idea but not if they are skin tight which mine aren't, by definition, this means that this will not be a good idea for the swim as you will effectively be wearing 2 arm weights.
To make it easier to put them on in the heat and with wet arms, pull them on, then roll them down from the shoulder to the wrist creating 2 'polos' and this will help to get them on.
Lastly I ended up with silly scars under my arms, because the arm coolers are elasticated at the top and you won't be used to the clearance required, be careful as mine rubbed 2 scars into the side of my under arms on my arm pit area but didn't realise due to the adrenalin til I finished.
Hope that helps.