These hand grips are helpful with a variety of exercises.
The most popular use for them, is while doing pull ups. They can help you prevent tears, or in the event you already ripped your palm, they can protect your skin while you heal.
The grips save on using hand tape.
In addition to pull-ups they can be used for deadlifts and kettlebells.
You can potentially find an application for these grips in any exercise that is grip intensive.
The leather, while not stiff, can be softened further with use and time, they will become more comfortable.