The Harmony has a 60% plant-based fiber filler with 40% being mulberry silk. The ceiba plant-based fiber is 8 times lighter than cotton and is the thinnest vegetable fiber available. The fiber is ultra elastic retaining its original form easily and quickly while being durable and wear-resistant. This is an eco-friendly fiber that is hand collected with no chemicals used when processed. Natural Mulberry silk is one of the most durable fillers out there with antibacterial properties and several health benefits. The silk contains 18 essential amino acids that aid in stress reduction. Mulberry fibers are thermoregulators quickly retaining heat and maintaining consistent temperatures regardless of weather, making it ideal for year-round use. On the outside, we have a 100% cotton cover with a 300 TC density in a jacquard weave. Threads that are used in this fabric are hand collected long cotton fibers making it maintain its strength, form and look through regular washing and use over several years.