The Obsidian Airflow bike helmet is the best all-around option for teens and adults for under $100. This helmet is a great option for commuting and every day use for short/medium distance rides. It has 22 vents to keep your head cool, it can be adjusted both horizontally and vertically for a snug fit, and it has a lifetime manufacturer warranty.
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Pro Great for everyday use
The Demon Podium helmet is lightweight and well ventilated to keep your head cool even on summer rides. It has a detachable visor for sunny days, and the fit can be adjusted to fit a cap underneath for colder winter days.
Pro Easy to clean
After a few rides, sweat and dust will inevitably build up in and around your helmet. You can easily clean it with a washcloth, and by putting the detachable padding in the washing machine.
Pro Great ventilation
This helmet has 22 vents, which will keep your head cool even on hot sunny days.
Pro Easy to adjust fit
The Obsidian comes in 2 sizes- S and M/L, and the minute details of the fit are adjusted by using the built-in click dials. This helmet adjusts both horizontally and vertically.
Con Too tight for larger heads, and too large for toddlers
This helmet might be too tight for people with a larger-than-average head, as this helmet comes in two sizes only and there's only so far you can go with the adjustable dial. The sizing starts at around 50cm in diameter, so it will definitely be too big for toddlers.
Con Detachable visor can be dangerous in the event of a crash
It is recommended to use this helmet without the visor because of its sharp and pointy shape. It can get detached in a crash and pose a health risk.