I may be preaching to the converted here for some, but for years I have sweated my .... off in the few hot days that we get on the bike, so decided to buy a mesh jacket. I didnt want to spend a fortune for the sunny days we do get, so went for the Buffalo Airflow at only £55 from J&S and I have to say it's marvalous. The wind just goes straight through it and keeps you lovely and cool. But dont wear it on a cold day as you will freeze!
They do it different colours, but plain black is nice.
If you have not tried these yet, I can recommend these, particularly at this price.
https://www.jsaccessories.co.uk/view_detail.php?cat_code=Buffalo Cool Flow Mesh Jacket

They do it different colours, but plain black is nice.
If you have not tried these yet, I can recommend these, particularly at this price.
https://www.jsaccessories.co.uk/view_detail.php?cat_code=Buffalo Cool Flow Mesh Jacket


