The Water Brick spa seat is a comfortable option for shorter spa users. Made of pvc-coated vinyl, the Water Brick is well suited to the spa environment.  
To ensure the seat sinks easily into place, the Water Brick includes a pouch which can be filled with marbles or pea gravel to increase the weight. Available in blue and black the Water Brick is a cushy 4" high.

Also makes a great head cushion for use out of the spa!