Why would you iron it?
If it's any kind of technical fabric I just wouldn't, it'll melt or you'll break it!
What do the instructions say?
i know alot of water proof gear likes to be tummble dried on low to refresh the fabrics too, but as far as i know these things are done on the lowest possible setting.
Hmm, I hadn't realised that, I thought it was just you wanting to look smart on your bike
I'd err on the side of caution tbh, keep it cool.
The other thing to check is what was in washed in. A lot of fabrics (goretex, event etc) have the waterproof coat that causes water to bead. If you wash the jacket in either normal detergent or fabric softener you run the risk of stripping the coating completely. I would use either pure saop flakes or one of the specilist cleaners like Nikwax tech wash followed by a very low iron. If this does not restore the beading then look at reproofing using TX or similar.
Well polytetraflouroethylene (PTFE) is normally used to create the breathable membrane in the jacket material. The idea being it forms small pores that water vapour can pass through but water droplets can't. This process fails if the outer surface of the jacket wets out and becomes saturated. This is why normally there is durable water repellent coating (DWR) applied to the outside.