1.Comfortable Cushion Bed Cover: This cat window perch is upgraded with thickened fluffy cushion bed cover, which give cats more comfort and while sleeping on it. The cover is made of soft plush fabric and cotton, perfect for keeping warm. Let your cats feel more comfortable while lying in this resting seat. It is of Velcro tape design, easy to remove for wash. 2.Simple Assembly Adjustment: The assembly of this cat window hammock is easy that only a few steps are taken to set it up. After the assembly is complete, you just need to screw the thumb screws to adjust the distance between hooks and supports to fit the thickness of your window sill. 3.No Drilling Suction Cups Needer for Installation: This cat bed is fixed on the carrier by two metal hook and supported by two wooden supports, without the need to damage the wall and the worry of the suction cups falling off. The metal hooks are widened. The surface with the windowsill is larger that protects your window from being damaged by the concentrated force. 4.Large Space Cat Window Perch: The size of the medium cat sill window perch is large enough for large cat. The main frame of this cat bed is made of thickened wood and hard metal. It is of great that it can holds up to 40lbs firmly on the window.