Nowadays, lift-and-slide doors are an obligatory element of modern apartments. On the one hand, they add elegance to the interior and on the other hand, they ensure the well-being of the residents thanks to the effective lighting of the rooms. The HST system based on the S 9000 platform meets all technical and visual requirements. Structures in this system are adapted to the installation of triple glazed insulating units with a thickness of 52m, and the heat transfer coefficients can be obtained even U=0.5 W/m2K. For the customers who appreciate the natural lighting of the interior we have the design version. In other words, an ordinary leaf in the fixed segment of a HST lift-and-slide door is replaced by a glazed profile the face width of which is reduced by up to 50% compared to a normal leaf.