From a distance it just looks like a subtle rainbow pattern but up close you can see the strings of commands. What is the code to? I don’t know, perhaps the very website they are featured on. Which would be funny.
Otherwise, these are standard pair of leggings. They have four way stretch and are made from microfiber yarn. There’s an inner pocket and they feature the usual raised waistband of yoga pants. Suitable for both a yoga practice and a codding marathon. You can get your own pair for $66.95.