LAFD PPE Drill Practice Test 2026 – Complete Exam Prep

Aramid fibers are added to PPE fabrics for their heat and abrasion resistance, so a brush shirt blend uses aramid to boost protection while the rest of the fabric (often cotton or another fiber) keeps the shirt comfortable and affordable. The percentage shown represents how much of the fiber content is aramid. About half of the blend being aramid—51% in this case—provides meaningful protection without making the fabric too stiff or costly. If the aramid share were much lower, protection would drop; if it were much higher, comfort and cost could suffer. So 51% aramid achieves a practical balance for a brush shirt.