An implantable lead comprises a lead body extending from a lead proximal end portion to a lead distal end portion. In one example, the lead body may comprise a heat-formed bias portion. In another example, an outer insulator is fused to the lead body. In such an example, a lead body fusable plug may be disposed distal to at least one conductor. In another example, the lead comprises an inner boot and an outer boot fused to one another. In another example, the lead includes an atraumatic tip fused to the lead distal end portion. In another example, the lead body is reducable in size using heat shrink tubing. In yet another example, two or more lead sections may be interconnected using an outer insulator fused to the respective lead bodies. In a further example, a stiffener member is fused to the lead body adjacent a lead component.