Oral B makes a floss similar to Superfloss but it is the Glide floss. It has the waxed ends and is my favorite for overcrowding. https://www.amazon.com/Oral-B-Glide-Pro-Health-Threader-Floss/dp/B000GGJCDY
My teeth are too crowded and tight for the floss piks specifically made for braces and I also found SuperFloss to be too thick. Alternatively, there are plastic threaders you can use with your normal floss. It takes more time but works. https://www.amazon.com/GUM-Eez-Thru-Floss-Threaders-Each/dp/B000GGJCDO/ref=sr_1_8?keywords=plastic+floss+threader&qid=1555263723&s=beauty&sr=1-8