When we refer to the sightline on our doors we are measuring the width of the visible frame between the glass panels. Our sliding doors are available with a choice of sightlines, theEDGE2.0 has incredible narrow 20mm sightlines that are barely visible, whilst the Grand Slider II has slightly wider 83mm sightlines. One element to consider when measuring sightlines is the depth of the panels as well, unlike our range or doors, some sliding door systems require fins, add-ons or reinforcing sections to be added to the frame of the door to provide rigidity which means the doors can look anything but slim when viewed from an angle.