Thanks for the replies, much appreciated

I had a look at Gore & Craft but wasn't sure about them...

I managed to find a kids sized icebreaker under top at a sale today & may have more options with sizing now! I found the Icebreaker XS base layer way too long. I also picked up some fingerless gloves and a beanie that i can wear when not running & in a cooler climate.

Just at a guess, being a wool weenie's the way to go in this instance? Going to Japan then US warmth to US cold to European winter back to Perth summer..

Oakleaf-have you ever worn ibex or smartwool arm warmers when running? Also, i've not worn tights when running here in the cooler temps but the CW-X ones look inviting. Lots of info & am looking at things you've suggested.

The other thing i just thought of...the marathon starts @9am so it may have warmed up by then. Travelling overseas for an event is making this a bit more of a challenge but more fun!

Thanks again

C