My Very First Recumbent is a V20

[Frito Bandito]

Same here. The best I’ve found is a Ekoi AR16 but the fit is a bit too tight to wear it longer than 1h and the magnetic attachment a bit wobbly. At the end of the day I reverted to separate helmet and glasses. Now that my two main bikes allow me to ride without a headrest, I’ll have more options so might start chasing the unicorn again…
The Carbonic looks nice but also awfully undervented for summer.

The Ekoi AR16 is a nice looking helmet. To me the shield looks the same as the Giro Air Attack shield which I really liked.

Yeah, the Carbonic is designed as a ski/snowboard helmet so it's probably going to run pretty hot in the Summer. It has a full, thin liner inside, in contrast with my Speedking that has a few strips from front to back. The Limar Speedking has 3 narrow slits in front so it also runs hotter than a typical bike helmet, but I didn't get so hot with it on that I felt I needed to get a helmet with better ventilation even on the hottest days (up to 37C). I always wore a thin beanie that I soaked with water which helped a lot in keeping my head cool with the V20s speed. I'll use the same beanie in it this Thursday or Friday in about 32C heat to see what happens. I'm pretty sure it will be fine as 34C is usually my limit. I'm really impressed with visor and how it flips up and I will remove the foam padding on the inside of the visor typical of ski helmets.