The ideal seat cushion for your spa! This cushion from Bestway features a soft polyester filling containing small lava stones that retain heat well for extra comfort. These also prevent the cushions from floating away. Features: Soft polyester filling Lava stones retain heat well Specifications: Color: black Gender: unisex Material: plastic, polyester Dimensions: 38 x 32 x 10 cm (L x W x H) Weight: 4 kg