Posa is a slim clip that sits high on your back and gives a gentle vibration the moment you start to slouch. It's a private reminder to lift your chest and stack your spine — nothing anyone around you can see or hear. It isn't a brace. A brace holds you up, and the muscles that should be doing that job get to switch off. Posa works the other way round: it prompts you, and you do the straightening. That's what turns it into a habit you keep rather than a device you depend on. What you get A nudge, not a jolt. The vibration is closer to a phone buzzing in your pocket than anything sharp. Invisible under clothes. Slim enough to sit flat under a shirt, blouse or sweater. About a week per charge with normal daily wear, topped up over USB-C. The Posture Blueprint & 14-Day Ergo Guide, included free with every kit — short daily resets you can do between meetings. Getting started Wear it for a couple of hours a day to begin with — desk time is the most useful. Most of the work is simply noticing when you've dropped, and that's the part Posa handles for you. Covered by a 90-day money-back guarantee. If it isn't helping you sit and stand taller, send it back for a full refund.