Fit is the most underrated factor in glove performance. Too small and the glove strains and tears, tires the hand and splits at the seams. Too big and it bunches at the fingertips, kills your dexterity and slides off at the worst moment. Getting sizing right across a crew is one of the easiest wins in the workshop.
How to Measure
Nitrile gloves generally run from extra small through to extra large. The simplest way to size is to measure the width of the palm across the knuckles, excluding the thumb, and then the length from the base of the palm to the tip of the middle finger. Match the larger of those two measurements to the manufacturer's chart. As a rough guide, most tradesmen land in large or extra large, but never assume, hands vary a lot and guessing wastes stock.
Sizing a Whole Crew
For a team, order a spread of sizes rather than a single default, and keep a few boxes of the extremes on hand for outliers. Nitrile has less natural stretch than latex, so accurate sizing matters more, not less. When you buy Grip-X or any nitrile glove in bulk, a quick round of measuring the crew up front pays off in fewer torn gloves, better grip and hands that are still comfortable at the end of the shift.