So what is Rocktape, anyway? It is a brand of kinesiology tape that is made of 97% cotton and 3% nylon. the adhesive is hypo-allergenic and contains no latex. The cotton allows for the tape and skin to breathe, and the nylon allows for the tape to be stretched so that the muscle or joint that is taped can have a full range of motion. In my personal experience with other brands, Rocktape's adhesive is the best and allows for about 5-7 days of continuous use through various workouts and normal showering.
Kinesiology Tape works by microscopically lifting the skin and layers underneath. This distributes physical stress, allows for more blood flow to the area, all while providing support and allowing movement to the area. Scientific studies are kinda here and there about kinesiology tape since its inception in 1979. There is also the recent lawsuit against KT Tape brand for falsely advertising that the tape is able to prevent injuries and provides pain relief. A study published in Journal of Orthopaedic & Sports Physical Therapy showed that kinesiology tape does not reduce pain intensity, but does increase a pain free (or less pain) range of motion for subjects with shoulder pain. Another study in 2016 concluded that k tape is effective as complimentary to physical therapy in injury recovery and management, but is not a substitute for therapy or exercise. (I think we could have figured that one out by ourselves!)
In my personal anecdotal experience, it has been an invaluable tool in my active life. It has helped me with working long days on clients, as well as helping me with better ROM when I am dealing with my chronic lower back pain. In my certification training with Rocktape, the instructor showed me how tape could help a client get deeper into a squat and reduce fatigue for runners on their long runs. Studies that I have found are inconclusive about reducing fatigue, some say yes short term, and others say more research is needed. This is somewhat difficult to study as pain and fatigue is very subjective due to different tolerances and lifestyle variables that may not be accounted for in these studies.
Personally I see nothing wrong with kinesiology tape and since anecdotally it has helped me and my clients and there are little to no adverse problems with it (I've only heard of minor skin irritation), I say let's use it! I'm pretty good about whiffing out BS fads and I would never sell or promote anything that I haven't tried or I've found that doesn't work.