Normal cyclist helmet. It causes more wind noise and generally messes up directionality because there is something above your ears.
A rear view mirror might change my decision, I keep intending to try some of those out.
A rear view mirror might change my decision, I keep intending to try some of those out.
It's modeled after this one: https://www.efficientvelo.com/home/safezone
The key component is the flexible, stays-where-you-put-it arm. Safezone is repurposing an industrial product called "coolant hose" - a 1-ft length costs less than $5. Epoxy a small mirror to the end, and attach it to your helmet with zip ties or velcro straps.
Here's mine: https://imgur.com/a/a9H7bXq
http://travellingtwo.com/resources/take-a-look-mirror
It's simple to clip on, and stays put once it is, I've been using this mirror for over 5 years and feel uncomfortable riding without it.