They are soft, colorful foam tubes made from closed-cell foam that does not absorb water.
Their primary use is as a swimming aid to help non-swimmers gain confidence in the water or for general fun and relaxation in a pool.
They are also widely used for water aerobics, swim lessons, and various pool games due to their buoyancy and flexibility.
Beyond aquatic activities, they can be repurposed for various DIY projects and home hacks, such as protecting sharp edges or use in robotics competitions.