Shore Rugs is handwoven from custom made silicone cord.  It is everything you could possibly want for an outdoor/indoor rug: waterproof, UV and flame resistant, hypoallergenic, non-slip, easy to clean, and durable with no need for underlays.  It is customizable in a variety of sizes and colors.   They say it is a highly supportive with a massage like experience, making it the first ergonomic rug.  (Interesting as back in the late ’60’s I did research on the marketability of an ergonomic rug; I got paid but then again maybe the rug never came to market.)