Abstract: A Criss-Cross harness system with a single strap mechanism that can be threaded through guides formed along a seat to allow restraint of an infant in a seat. The strap can be held behind the seat by a quick release mechanism that can also be disengaged by pressing a single button or squeezing two handles/paddles together. When a passenger attempts to pull on the strap to remove the area of the body held down, the entire strap mechanism gets re-tightened, thereby holding the securely in the seat. The Criss-Cross harness system can be used with a high chair, a stroller, a swing, a race car, airplane cockpit, amusement park ride, wheel chair.