Ortega OGSHK-BK Guitar Strap

This is a neck strap as opposed to a shoulder strap. Works for every guitar with a soundhole and doesn't require strap buttons. It's for those situations where you need to move around a lot, such as when playing to children. It's certainly not as comfortable as a shoulder strap. I tried it with a 4/4 classical guitar and a guitalele and it works fine.

I like to have one of these around for casual use at home.
This kind of straps are never going to be very comfortable in the long run.
For a fraction of it's price you can find ones that do the same, in fact I have had one way simpler that is still in use and it has a bit of padding for the back of your neck.
The Ortega feels like it's done with better materials but is not as comfortable to wear for long stretches.