This is a sports belt (weightlifting belt / lower back support) from Nike.
Brief description:
It is black with a yellow Nike logo.
It has a wide padded section in the middle for lower back support.
Its ends are long with an adjustable buckle to tighten it around the waist.
Made from durable fabric and padded for better comfort.
Typically used in:
Gym workouts and weightlifting
Squats and deadlifts
Back protection and improving stability during exercise.