I overheat very quickly any time of year! Thinking more Autum/ Winter/ Spring, maybe Summer the way summer is looking!
Also looking to use in on my bike when I cycle to work, at the moment still having reasonably chilly mornings where I need a bit more than just t-shirt.
Thanks everyone, looks like a Montane it is! whats the sizing like? don't have anywhere around here that sells them so will be an online purchase. I thave a 38" chest which Montane say should be a small?! I've never classed myslef as small.