Measures 13” x 13” x 4. 5” for our round zafu shape, and 17" X 10. 5" X 5. 5" For our crescent form. Perfect fit and size to relieve joint stress and provide spine support while you master your practice.-Sedona’s removable, machine-washable exterior is made with 100% cotton -Sedona’s core composes of 100% sustainably sourced buckwheat. To change the density, simply unzip the interior cotton cover and add or remove hulls to achieve desired firmness.-Use Sedona as a firm pillow, yoga Block, or other uses in your everyday life and wellness routine. Easily transport Sedona wherever your practice takes you with its built-in strap.-Include Retrospec Sedona meditation cushion into your routine to reduce fatigue, improve posture, and promote longer, deeper meditations.