Aerofit Post Market Investigation

Inclusion Criteria: * 50Kg\< body weight \< 136Kg * Cognitive ability to understand all instructions and questionnaires in the study * Intended for unilateral/bilateral individuals that fit the indications for use, fit within the specified criteria and with the limb length, shape and ability to use a prosthetic liner: Activity level: K1 - K4, Impact level: Low to high, Amputation level: transfemoral * Congenital transverse deficiency at femoral level * Using Seal-In Silicone Liner and Direct Socket or AeroFit Seal-In Liner and AeroFit Socket * Able to use AeroFit Solution, see Figure 7 AeroFit Seal-In Liner Sizes and Figure 8 Minimum socket height per liner profile. * Residual limb profile: Standard or conical * Willing and able to participate in the study and follow the protocol * Confident (all day) prosthetic users for more than 3 months * Older than 18 years Exclusion Criteria: * Participating in another research study that may affect the participation or results of this study (in the opinion of the investigator) * Users that have received Botox injection as treatment for residual limb sweat issue in the last 4 months