When sourcing nitrile gloves, you must prioritize material purity and thickness. Look for 100% nitrile butadiene rubber to ensure the absence of latex proteins, which prevents allergic reactions. The thickness, usually measured in mils or grams, determines durability; 3-mil gloves are standard for medical exams, while 5-mil to 8-mil gloves are required for heavy-duty industrial or chemical handling. Additionally, ensure the gloves feature textured fingertips for enhanced grip in wet or oily conditions.