While together the Layla and Purple Harmony pillows offer adjustable firmness options, their construction and materials differ. The Layla pillow is filled with a blend of Kapok fibers and shredded memory foam, even as the Purple Harmony pillow features a unique gel grid structure surrounded by a layer of hypoallergenic Talalay latex. The Purple Harmony pillow is also designed with a moisture-wicking, breathable cover, which helps to maintain you cool throughout the night.