Graphite latex (GL) * is the office favorite. GL is a mix of plant made latex and graphite. In bedding, graphite serves as a fire retardant and temperature regulating material that eliminates the need to use chemicals to protect sleepers. GL is biodegradable at end of life meaning it is kinder to our planet. GL is also anti-bacterial, anti-dust mite, hypoallergenic and cooling to sleep on. This option is however the most expensive but when you spend 1/3 of your life in bed it is worth getting it right. *graphite latex is only on the top 2.5cm of the wedge.