Inclusion Criteria:  Physician diagnosis of Postural Tachycardia Syndrome (POTS) Resident of Canada Owns waist-high compression garment: medical grade or commercially available tights with a pressure rating provided (e.g. 15-18 mmHg, 20-30 mmHg, 30-40 mmHg) Optional Sub-Study: owns an abdominal compression garment (e.g. abdominal shapewear, waist high shorts) Able to participate in a 4-day study (2x2 day segments with a 5-day washout period)  Exclusion Criteria:  Overt cause for postural tachycardia (i.e., acute dehydration, thyroid disease) that precludes POTS diagnosis Not a resident of Canada Participants with somatization or severe anxiety symptoms will be excluded Pregnant (self-reported) Inability to tolerate compression garments for the duration of the study Does not own a waist-high compression garment Other factors which in the investigator's opinion would prevent the participant from completing the protocol, including poor compliance during previous studies