In order to best serve their customer's needs, A.R.E. has revamped their Tonneau Cover line to feature 3 models; LSII, LSX, and LSX Ultra. There are features and benefits to each model, so to choose which best fits you, please check out their new Tonneau Cover Comparison Sheet:
http://www.4are.com/pdfs/ARE_Tonneau_Covers.pdf