Comfy microfiber sheets.  To my surprise, the sheet sets stays a bit cooler than most sheets, which is great for the warm summer nights.  After 3 washes I got no piling or anything unwanted.  I do appreciate that the sheet set is microfiber as it dries quickly and easily as well as folds a bit smaller to make storing easier.  
On the softness scale, I'd say there were a high 3 almost 4 out of 5.  The sheets are 33% viscose from bamboo and 67% polyester, just to give you an idea of what to expect.  Ultimately this was a pretty shoot sheet set and fit me queen sized bed perfectly.