I really liked the Avita Carbon helmet, as it was quite comfortable, well constructed, and looks pretty sharp. It has six nice soft anti-microbial padding on the front 75% of the liner, while the rear retention system uses two slightly stiffer foam pads. All the padding except for the rear, was removable, so it could be washed when it started to get nasty or dirty.
The retention system floats, and is attached on the sides by the temple and then up inside above the ears, so it is free to move about, and it sort of self adjusts itself to fit the oddities of your head. The retention uses a dual ratcheted system, and could be used on the fly, especially for tightening, which was nice when you were approaching more technical terrain, but it was more difficult to loosen, and took some practice and technique to make that adjustment. The ratchets worked really well, and they wouldn’t accidentally loosen up on you during a ride. The chin buckle closure was quick and easy to use, and the strap adjustment had a locking clamp, as did the ear adjusters, so it stayed exactly where you left them. On really long rides when my head swelled up, and I found that the front of the helmet caused a slight bind, and although I could loosen the retention to alleviate it somewhat, but it was still an annoyance (my head shape?).
The 22 vents worked really well, and had a good throughput, and I never overheated, which is surprising since the rear ones seemed a bit constrained compared to the rest of the blocky holes. Attaching helmet camera’s was really simple, due to the placement and shape of the vents, and a nice flat spot on the top. I enjoyed the extended rear coverage (like a skate helmet), which protrudes downward decently, and it provided excellent sun and back of the neck and head protection. It also provided better fit, cradling a larger portion of the head, and it decreased the tendency for the helmet to roll backwards. The breakaway visor sat really low, which helped block the sun, but on occasion if the helmet creep forward and started to droop, you lost a tad of peripheral vision?