These positioners use vacuum suction to conform the enclosed beads around a patient’s body creating a firm and stable position. Simply remove the safety clip and click the one button valve to let air back in allowing the bean bag to move freely again. The entire one click valve system is replaceable if damaged. Our bean bags are made with a urethane bladder (rather than PVC like the comparable Olympic Vac Pac ®), this equates to added durability and longevity.