If you climb it is very important to have the right and proper equipment for the adecvate climbing type you have chosen. Like any other equipment, the harness you will choose must meet the requirements of the climb. According to that, there are different types of climbing harnesses, each of them with its own advantages and disadvantages.
A sit harness is made of a waist belt and two leg loops which are connected in the front of the hips through a webbing loop (belay loop). These type of harness is commonly used for recreational activities such as abseiling and rock climbing, as it provides security and at the same time allows enough room for movement of climbers. . Ensuring the harness fits correctly is very important so you will be able to avoid pain in the upper thigh area caused by the leg loops being too tight around the upper legs. At the same time it ensures that the climber flipped over in a fall does not slip out of the harness.
A chest harness is worn around the shoulders, usually with a sit harness to provide an additional attachment point. This combination will prevent you from turning upside down. The chest harness enables better balance in some situations such as when carrying a heavy pack (as the centre of mass is below the connection to the rope) and when the person in the harness may be unable to maintain an upright position (due to injury or other influences).
A full-body harness is the combination of a sit harness and a chest harness, in most cases permanently connected to each other. It is most commonly used in industrial/rescue situations, and also used for young climbers as well as adults with slim figure and those who need additional support in case they cannot stay upright.