LUCID 4 Inch Two-Sided Goose Down Alternative + Memory Foam Mattress Topper 3-Year Warranty - Cal King Thick dual layer plush topper with 2" memory foam + gusseted down alternative gel fiber fill Down-Like softness of a featherbed with the customized support of premium memory foam Removable 250 thread-count 100% cotton percale cover Reversible for plush or support comfort options Careful construction guarantees no prohibited phthalates