Prosthetic liners for BKA provide cushioning, reduce friction, and improve suspension between the residual limb and prosthetic socket. Materials such as silicone, gel, or thermoplastics are chosen based on skin sensitivity, activity level, and comfort requirements.Proper use and care of liners prevent skin irritation and maintain prosthetic performance. Replacing liners as needed and keeping them clean ensures a secure, comfortable fit that allows below-the-knee amputees to move efficiently and confidently.