First you need to determine what voltage you are working with. All EV repair gloves are rated – and color coded – by the maximum voltage the gloves can withstand. It is generally accepted by EV manufacturers Class 0 gloves are the proper choice when working on EVs, as they are rated at 1,500 volts DC maximum use voltage. You must identify what class gloves you need before ever working on a potentially charged electric or hybrid vehicle.
Insulated rubber gloves are not one-size-fits-all. Purchase gloves based on the hand size of the technician using them. Some glove manufacturers only offer small, medium, and large. Others offer half sizes, in inches.
Always choose the same size gloves. For example, if you wear size 10 insulating Rubber Gloves, choose size 10 in the over and under gloves. For complete comfort and safety, the three types of gloves are to be layered as follows: cotton under gloves/insulating rubber gloves/leather over gloves.