Bear Motion cases are my favorite. They are super thin and add a good amount of grip. Love the texture.

http://www.amazon.com/gp/aw/d/B00MDF3CKK/ref=mp_s_a_1_4?qid=1422230863&sr=8-4&pi=AC_SX110_SY165_QL70&dpPl=1&dpID=51RC2SV2W4L&ref=plSrch