found these on other forums

"Black (women's) hairnets, bought from a chemist or tesco, stretched over the helmet will
do the trick. 2 in a packet for 99 pence. That's what I use"

"Kompact Pro, Shield, Diablo and Neon all have insect nets fitted."

"The OGK Kabuto Mostro and the new Redimos both have insect screens and are excellent helmets."

"My Giro Ionos has a removable insect net which works very well. My Spiuk Nexion has a built in one too"

"bought a new road helmet this year with a focus on stopping bees and went with the Lazer Genesis. The anti-insect netting is a separate accessory for about $25. Other options: Rudy Project Sterling. Uvex Boss. Spiuk Nexion and Zirion, but Spiuk can be hard to get in the US right now. Krask is a newer helmet brand that also has 1-2 models that have anti-insect netting pads as separate accessories. One of the other Italian helmet brands like Lamar may have it as well"