The Sigma Passenger Harness by UPT is a sophisticated and comfortable harness specifically designed for tandem skydiving passengers. It prioritizes safety and comfort for the student during all phases of the skydive.   

Key features include a design developed with input from a cardiologist to ensure proper blood flow and prevent discomfort or lightheadedness. It typically features a hip-hugging horizontal back and belt strap system that positions the main lift webs towards the front of the upper body, avoiding pressure on the upper legs and torso. This design also aids in lifting the legs into a safer landing position after parachute deployment.

The Sigma Passenger Harness by UPT is highly adjustable, often with numerous adjustment points to accommodate a wide range of body sizes and types, ensuring a snug and secure fit. It also includes a Y-strap for added security. Some versions may include a pocket or snap for attaching a hook knife. The overall design aims to provide a comfortable and safe experience for first-time skydivers.