The patented liquid core makes hooping 10 times easier than a regular hoop. Wave Hoops make hooping cool with their holographic colors and its liquid core. Wave Hoop has been the number one selling hoop this decade! It has been in the top 10 summer toys the past 10 years, today's kids know "Wave Hoop" before "Hula Hoop". The patented liquid core makes hooping 10 times easier than a regular hoop. Wave Hoops make hooping cool with their holographic colours and its liquid core, there is nothing like it on the planet.