The Silk Pillow has a gusseted construction with cotton twill piping for long-lasting support and durability. This pillow is made of a 100% cotton fabric shell with a 220-thread count. Natural long strand silk fibers wrap around a micro-gel inner core which adds a firm layer of support and enhances natural breathability. These fibers help control humidity, body temperature, and naturally deters allergens leaving you with lightweight and luxurious comfort making this an ideal choice for all seasons. When not in use, the zippered vinyl bag makes for perfect storage.