Inclusion Criteria:  Ages 18 and above Weight ≤ 280 lb Ambulate at a K3 level or higher-level determined from patient EHR At least 3 months post-amputation per physician discretion Residual limb length greater than 4.5 inches Use of a passive prosthesis Unilateral transtibial amputees Must be able to ambulate without any assistive devices Subjects must be able to follow directions and give informed consent on their own  Exclusion Criteria:  Conditions and/or co-morbidities that would prevent wearing a prosthetic socket, affect gait, or influence function of the contralateral limb Other amputees Cognitive deficits or mental health problems that would limit ability to consent and participate fully in the study protocol Women who are pregnant or who plan to become pregnant in the near future Individuals diagnosed with renal failure Participants unwilling to wear a cloth face covering for the duration of each visit