When evaluating nitrile gloves, the most critical factor is the thickness (measured in mils). For medical or exam-grade use, 3-4 mils is standard, while industrial or automotive tasks require 5-8 mils for puncture resistance. You must also verify the AQL (Acceptable Quality Level); a lower AQL (e.g., 1.5 or lower) indicates a higher quality standard with fewer defects. Additionally, ensure the gloves are 100% latex-free to prevent allergic reactions and feature textured fingertips for enhanced grip in oily or wet conditions.