Disclosed is a decoupling assembly for decoupling forces applied by a tube on a patient interface structure configured to deliver of a supply of air at positive pressure to the entrance of a patient’s airways for treatment of sleep disordered breathing, the patient interface structure comprising a flexible base portion connected to a seal-forming structure, the patient interface structure being held in engagement with the patient in use by a seal positioning and stabilizing structure connected to the flexible base portion, the decoupling assembly comprising the flexible base portion, the seal-forming structure, and at least one of a portion of the seal positioning and stabilizing structure, a swivel elbow, a ball and socket, a swivel sealing ring, and the tube. The flexible base portion comprises flexible bellows on lateral sides. The swivel elbow comprises a vent. The swivel elbow and/or the swivel sealing ring comprises a radial seal. The seal forming structure comprises a pair of nasal pillows connected to the flexible base portion by thinned regions of the flexible base portion and comprises a frusto-conical portion having a flexible surface on an underside connected to a stalk between the flexible base portion and the frusto-conical portion. The nasal pillows can rotate at any selected angle. The portion of the seal positioning and stabilizing structure comprises a flexible strap with a flexible forked portion. The tube is retractable.
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