Is this pillow cover removable and washable?

No. It is a single filled pillow with a sewn cover, so it is spot clean only. The polyester-cotton blend wipes down but should not go in a washing machine.

What size is it, and will it fit a standard sofa?

It measures 14 inches tall by 26 inches wide, a long lumbar shape. That spans most sofa and bench seats and sits well in front of square throw pillows.

Does it come with an insert?

Yes. It is sold as one complete pillow with the fill included, not a cover-only listing.

Is the red color true to the photos?

The red reads as a warm, slightly muted farmhouse red rather than a bright primary red. Screen settings can shift it, so expect a softer tone in person.

Can I use it outdoors on a porch?

It is an indoor accent pillow. The cotton in the blend absorbs moisture and the fill is not weatherproof, so bring it inside after use on a covered porch.

How does it compare with a square throw pillow?

The lumbar shape fills horizontal space on a sofa or bench where squares leave gaps. It is less versatile for chairs and beds, where a square usually fits better.