A harness system for supporting a person off of a ground surface. The harness system may include a seat supported by a strap attached to the seat. The strap may form one or more leg containing loops for keeping a person securely positioned in the harness. The harness may also include a climbing strap for securing the harness loosely to a support device, such as a tree, while a person climbs a support device. The harness may be secured to a person by tightening a waist strap around the person's waist. A top strap section forming a portion of the waist strap may be used to support the weight of a person sitting in the harness. A hanging strap may be used to secure the harness to a support object by forming a loop in the hanging strap around the top strap section of the waist strap.