Rukka AirRider here and even I had a soaking back when I got home. Was so hot and sunny 1-3pm when I was on the bike that I couldn't even see the satnav on my phone. Usually wear a gym top under the jacket but couldn't find one this morning. UnderArmour do some amazing gym boxers which work wonders on the bike but can't find. Absolution to wet socks yet apart from carrying a spare pair for when I get to work.
Bought some super thin David ghandy t-shirts from Marks on the way home so will see how they are tomorrow.