The tube’s material is especially flexible polyurethane and it has elastic memory after being subjected to flexion, folded or even knotted over itself for days. The tube’s walls section has been studied to maintain the needed rigidity on the mask strap’s pressure area to avoid damaging the air flow on this area.
Really comfortable nozzle, with minimized thickness on the gums area to keep a great comfort even with long usage. Rounded pins with thin basis. Assembly nozzle-tube very reliable.