Not sure about durability but I just got this Bear Motion case for my new Moto X. I absolutely love the texture. I'm not really sure what it is but it feels like slightly abrasive rubber/plastic. I would definitely say "grippy" describes it. Also at $7 on Amazon Prime it's very reasonable.

http://www.amazon.com/gp/product/B00EE26TMI/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1

Bear Motion works well: http://www.amazon.com/Bear-Motion-Premium-Google-Motorola/dp/B00EE26TMI/ref=sr_1_1?s=wireless&ie=UTF8&qid=1416067338&sr=1-1&keywords=bear+motion+moto+x

This has a 'soft velvet' feel to it, not the hard shiny plastic. Great case.