True gel flotation feels like you are sitting on a cloud. Cover has two sides: One side is water-resistant blue vinyl and the other is soft grey cloth. The gel reduces heat build-up and discomfort after sitting for a long period of time. Provides comfort by molding to individual body type. Contains over 4 lbs. of gel with a 1" piece of foam for stability. Supports up to 200 lbs. Measures 1 " x 16" x 17".