Temperature Control Liner Materials and Prothesis Use

Eligibility Details: Inclusion Criteria: - use of a prosthesis with liner suspension, - at least one year of prosthesis use, - a well-fitting socket, - a matured residual limb (stable limb volume) that has not required socket modifications in the previous year, - the ability to walk with the prosthesis outdoors without notable limitations (K-Level 3), - stable weight, - absence of acute medical conditions that would temporarily affect the ability to use prostheses. Exclusion Criteria: - use of a non-standard liner size, - current use of a PCM liner as the regular suspension system, - known allergies against liner materials, - any inability to understand the protocol and to comply with the associated tasks, such as maintaining a log of days when the prosthesis could not be used. - anticipated provision of a new prosthesis or extended (longer than one month) absences from the region during the study period