product Specifications: single layer 51*31cm (0.45KG), double layer (0.65KG)1. Durable cat hammock window features a breathable, durable mesh base, providing a secure foundation for your pet to lie on.2.Special Space - Single/Double hammock can be mounted on any smooth and airtight surface, such as tiles, stainless steel, glass, mirrors, refrigerators, washing machines, metal coatings etc., to avoid using on frosted glass, patterned glass or curved glass.3.Easy Install- Don''t need to use tools. Set up and mount this space-saving window cat bed in a few minutes, without any tools Mesh cat hammock can be quickly breathable, scratch-resistant, the whole set can be disassembled and assembled at will, easy to clean. You can cover a blanket for our cat if cold , it can be used all season.4.For Any Size Cat - The stack cat window perch is for indoor use and accommodates even the largest of cats. Your cat can jump in and jump out of this resting seat, which is another kind of exercise to keep good health of your cat.5.Design - Weve designed our cat window bed to be the ultimate relaxation spot for your cat to sunbathe and watch the birds outside