Does the rubber backing keep it from sliding?

Yes. The rubber backing is the main grip feature and holds the rug in place on hard floors better than a rug pad alone. On carpet it grips less, so a pad may still help.

Can it really go in a washing machine?

It is sold as washable, but a 6x9 rug is large. Check your washer's drum capacity first; many home machines cannot fit a rug this size, so a commercial machine or spot cleaning may be needed.

Is it soft enough for a living room?

It is a low-pile rug, so it feels firm and flat rather than plush. It suits high-traffic areas and homes with pets, but not people who want a thick, soft surface.

Can it be used outdoors?

No. It is listed for indoor use only, and the rubber backing and fabric are not made to handle rain or long sun exposure.

What sizes and colors does it come in?

This listing is the 6x9 size in a black and multicolor striped pattern. Other sizes and colorways exist in the line, so confirm the size and color before ordering.