The organic cotton fabric used in the mattress is woven in the Carolinas, but the organic cotton comes from either New Mexico, Texas, or India depending on the buying season and availability. Domestic is the primary source, but not guaranteed. The fabric that we use is a circular knit for the sleep surface and a canvas for the border of the mattress.
No, we do not use polyester in our fabric. It is all GOTS certified organic cotton fabric.
Although, when we stitch the organic cotton fabric to the wool batting, we use a polyester thread to transform the organic fabric and eco-wool batting into the quilt that you'll sleep on.
We try to disclose as best we can what goes into making our mattress, like the use of nylon zippers and polyester thread to stitch the organic cotton fabric and eco-wool batting together, even though the federal law labeling requirements do not require us to disclose materials weighing less than 1% of the total weight of the mattress. Keep in mind that the organic cotton fabric that we use does not contain polyester even though the GOTS certification states "A textile product carrying the GOTS label grade 'organic' must contain a minimum of 95% certified organic fibers whereas a product with the label grade 'made with organic' must contain a minimum of 70% certified organic fibres [sic]".
For the sleep surface, we use a circular knit fabric which is a method for converting the organic cotton yard into a fabric. It is made on a machine that knits the organic cotton in a cylinder – a t-shirt is the best example of circular knit fabric.
The circular knit process links the yarn in a continuous chain that not only gives strength, but also allows the fabric to be lightweight, more flexible, and pliable than a woven.
Some mattress companies will use a twill or canvas on the sleep surface which will provide a stiffer and firmer feel. In most cases, people feel the Spindle may have a slighter softer initial impression to the mattress. The choice of fabric isn’t a matter of right and wrong, but a personal preference. Since firmness is subjective, some people may not be able to tell any noticeable difference between the two where as others may feel a significant difference.