Material

Do not be bent on buying real leather gloves. Fitness gloves are about being comfortable and not being trendy. When leather gets wet too often it damages and becomes somewhat hard. With frequent workouts leather gloves will get damaged very soon. Opt for specialized durable synthetic perforated materials that are more enduring than natural leather in terms of their properties and absorb moisture.

Padding

Pay attention to palm protection. Special soft inserts on fingers and palms reduce the barbell pressure on your hands and improve your grip strength. High-quality inner layer in fitness gloves helps preventing calluses.

Wrist

If you work with large weights at the gym, go for gloves with wrist protection. These gloves are made using special technology that ensures natural position of your wrists when you do exercises.
And the last thing: gloves should fit properly on your hands bringing comfort to every training session you have. Do not buy them online. Try on a glove at a store, hold a dumbbell, a barbell with it, feel the grip, make sure you feel comfortable in it.