If you usually wear size S or smaller– go with Pulsetto Fit.
It’s built for slimmer necks and gives a snug, secure fit.
Even if you wear size M or larger – Pulsetto Fit still works great, and comes with a few extra perks, including 20% longer battery life and a more fun stimulation mode that rises and falls like a gentle wave.
If you're on a tighter budget – Pulsetto Lite is a more basic option for larger neck sizes.