Inclusion Criteria:  Diagnosis of POTS Participant self-report of heat or cold intolerance Willingness to wear the Embr device for 3 weeks, charging the device daily, and Have a working smartphone (iPhone 6 or greater; or Android 8.0 or greater Comfortable downloading and using the companion app on their phone Able to provide informed written consent Able to complete written questionnaires  Exclusion Criteria:  Prior or current use of the study device Hypohidrosis, hyperhidrosis, or anhidrosis, as determined by sudomotor testing; peripheral neuropathy; perimenopausal, menopausal, postmenopausal state; temperature intolerance due to other medical disorders (i.e. malignancy, systemic autoimmune disease) Medications known to affect sweat function Non-English speaking