The coaster is fantastic in the hot tub or by the lake. Ideal for swimming in the river or in the sea. There is no worries that they will tip over at all, because with our full 3-inch depth and large buoyancy they are not head-heavy and won't curl. They even withstand the jets of your hot tub and work perfectly. Most pool drink holders are 0.2mm thick, but we designed them from 0.6mm material which is three times thicker and more durable.
