Thanks for responses - I've ordered a pair. Breaks the rule of "never try something new for the first time in a race" but, as someone said, if they don't work I can always roll them up or stuff them in a pocket. Weather looks to be definitely going in the right direction for Sunday, but I'll believe it when I see it!
Grin - one lap of the Mojo bike course has a total climb of 78 feet, so I should be safe there. My wife looked at the vertical trace of the route, spotted one slight undulation and said "that's probably the kerb stone on the road!".
Was wondering if anyone has any experience of arm warmers for the cycle stage of a long tri. Doing Monster Mojo this weekend, and I'm aware the water's going to be cold - but, at the moment, the weather forecast is good so I'm not sure I want to put a jacket on on the bike. Was wondering whether arm warmers with my pirate monaco would give me a half-way alternative.