uPVC profiles are frames made from un-plasticized polyvinyl chloride (uPVC) that are used to construct windows and doors. 

A uPVC sliding windows are windows that slide horizontally. They are easy to use, durable, and provide good ventilation.

A uPVC 2 track sliding window is a window with two tracks in the frame that allows for two sash panels to be inserted. The sashes move horizontally on the tracks, allowing the window to open and close.

A uPVC 3 track sliding window is a window with three parallel tracks in the frame that support three sashes. The sashes can be opened to create a larger opening for ventilation and a wider view.