This study evaluated several composite materials in detail in order to optimize below-knee prosthetic sockets. Extensile and fatigue testing yielded valuable information about each group's mechanical characteristics. The yield stress, ultimate stress, and modulus of elasticity (E) in the perlon group (Group A) were determined to be 10.216 MPa, 38.046 MPa, and 1.14 GPa, respectively. However, with a modulus of elasticity (E) of 2.55 GPa, a yield stress of 90.23 MPa, and an ultimate stress of 103.177 MPa, the carbon fiber group (Group B) showed noticeably improved mechanical characteristics. Finally, the glass fiber group (Group C) showed a modulus of elasticity (E) of 1.17 GPa, a yield stress of 31.862 MPa, and an ultimate stress of 42.934 MPa. The results demonstrated carbon fiber's significant influence on material performance. Carbon fiber fatigue showed better fatigue resistance than perlon, highlighting the longer lifespan of carbon fiber-based sockets. Interestingly, ambient temperature was used for all of the testing. The interface pressure study reveals that the lateral side (560 kPa) and rear side (564 kPa) have the highest recorded values. This demonstrates that the pressure was evenly distributed throughout the tissue and away from the bony parts, improving patient comfort and being compatible with the suspension's dynamics and the user's comfort when walking. The safety factor results for Groups A and C raised questions and pointed to possible design flaws. Group B, on the other hand, showed generally satisfactory safety standards, above 5 for most of the socket area, with a minor section below 5 indicating potential for improvement. The stress distribution for groups stayed below 2.5 MPa and below 10 MPa. [ABSTRACT FROM AUTHOR]