Rush Mattress, based in High Point, North Carolina, is a specialty mattress manufacturer. Not to be confused with specialty sleep (mattresses without metal coils), specialty mattresses are tailor-made or customized to the specifications of retailers and distributors.
Cotton, one of the oldest textile fibers, continues to be one of the most used, even with the wide use of synthetic fibers as well as other natural fibers, and it still is an important material in many mattresses.
Overall, judging by customer reviews and independent reviewers, if you want an all-latex mattress, the Spindle Mattress is a good one for the price. Spindle does let you know if, by your measurements, sleeping position, and preferences, the Spindle Mattress might not be your best option.