The frame external in keyaki (japanese hardwood) size is same like a "kyoma" size (Kyoto-module) tatami: the golden ratio of tatami mats! 1910 x 855mm (leather mattress sizes are 1810 x 755mm). The leather is going to be joined with a simple double stitch quilting and thru stitching to keep the tufting in place. This project is developed giving high priority to the design (simplicity, sharpness, lightness) but when it comes to comfort, I know you will accept no compromise. The mattress is finished with fine full grain leather (other versions with japanese traditional fabrics etc. may be available upon request). The filling consists of 90mm of hard chip urethane and 20mm of low repulsion urethane. The whole thing is wrapped with acrylic non woven fabric which allows the leather to move smoothly. The mattress side will be tightened at 90mm thickness while the filling is more than 110mm. This results in a sharp and tight edge and a soft yet supportive super comfortable mattress.
