1. [For Stomach Back Sleepers]Stard Size-18x26x2.5 inches, 1 pieces per pack, which can be machine washable whole pillow. Special design for stomach sleepers back sleepers who are suffer from back or neck pain. 2. [Ultra Slim Flat]Only 2.5 inches, it's an ldeal height, a low profile for stomach, back even small-framed side sleepers. 3. [Why choose Thin Pillow]If your pillow is too high, your neck muscles may will be strained licked after a period of tension, make you suffer from nack shoulder pain. Our thin pillow design for this, espcially stomach sleepers back sleepers, they need need thinner pillows which will naturally stretch the neck muscles, support your head neck. 4. [Filling Evenly]Filled with 3D hollow microfiber, cotton cover. Baffle box construction 5 quilting grooves for air ventilation when sleeping, also makes the filling keep evenly, will not clumped even after washing.Piping edge adds a decorative finish to the pillow makes it more durable.