Climbing harness
A sit string harness looks like a belt, which is connected to two loops. The belt is worn around the waist and the loops are worn at the legs the connection is worn in the front. This connection is called belay loop. In this connection usually the knots are tied. Also it's used to belay the climber, with a knot or a securing device, like the Grigri. This is the most common type of climbing harnesses.