I have been buying C-in2 undies for 5 years now. My previous go to favs were pop stripes (mainly bc of the flashy colors and patterns) and Zen (mainly due to fit, comfort, and some funky colors you can't get anywhere else) The spectrum line is my new personal favorite. I only bought 4 this time as I wanted to try them out but the colors and designs are really flashy attention grabbing and the spandex flex is super comfy. They are like a second skin. Hopefully c-in2 keeps these ones in the rotation forever like the Zen line. I won't buy anything but Zen and spectrum from now on.