Kate, thanks for sharing this feedback. We’re sorry to hear that the Wave didn’t help you feel calmer. Embr Wave cools or warms in, well, waves since our bodies respond more strongly to changes in temperature vs. steady temperature—think of how quickly a cold pool stops feeling cold after you’ve been in it for a minute or two. Cooling or warming in a pattern keeps your body from acclimating to the sensation over the course of a session, so you can get more effective relief that lasts longer. We know that temperature is personal, though, and what feels really good for one person might not feel as good for someone else. If you didn’t feel the Wave was helpful for your PTSD, we hope that you’re able to find something that works better for what you need!