The Water Brick Water Seat doubles as a more comfortable spa seating alternative while increasing the seated height for shorter spa users. Made of pvc coated vinyl the Water Brick is well suited for the spa environment. At over 4" thick the water seat offers a great deal of comfort when compared to sitting directly on any spa surface. To ensure the seat sinks into place, a removable pouch has been included which can be filled with marbles or washed pea-gravel to increase the weight and/or height of the water seat. The spa experience is meant to be relaxing, let theWater Brick complete the experience. WATER BRICK WATER SEAT Provides added comfort for the spa experience Available in Blue or Black PVC coated vinyl construction w/ foam cushion core Safe for use with all spa chemical systems Removable pouch can be filled with marbles or washed pea gravel to further increase the weight or seated height of the water seat Product dimensions - 15" x 12" x 4"