Consumers buy furniture for a variety of purposes. Indoor furniture tends to be more expensive than outdoor furniture and also has surfaces such as lacquered wood that might ruin if exposed to outside conditions. Not all chairs and couches would ruin on a screened in porch or even by the pool side, and these versatile creations are called dual purpose furniture. This is not pop up picnic tables but wicker chairs and plush nylon love seats that feel like indoor furniture but can withstand a bit of rain and snow.
The secret is that the fabric and the stuffing are all synthetic. This means that nothing mildews, and cushions can be removed and wrung out if necessary. Furniture like this can be put in many locations, but have their best utility near the outdoors like an extended porch. They are easy to move, and might be compact for small den spaces.