PBI Max incorporates a new design, creating a lightweight high performance fabric. Brochure Where to Buy WHY CHOOSE PBI MAX? Best thermal stability available; offers firefighter insurance for worst-case situation. 235lb initial tear strength – over twice as strong as any other outer shell. The comfort-twill weave adds flexibility and has lighter weight than competing outer shells. Reduced stiffness and increased ease of movement enhance the garment’s ergonomic design. Superior TPP and flame protection at a lower weight.