It’s made from plant-based, all-natural ingredients, and is the first of its kind to be both 100% recyclable and circular, we’re told, with McCartney saying its “able to be safely returned to Mother Earth as nutrients at the end of its life”.Mirum is a customisable material made in a three-stage process using bioneutral, certified bio-based ingredients such as natural rubber, natural fibres, plant-based oil and pigments like biochar and rust – “containing no plastics and requiring no tanning or additional water inputs to avoid creating wastewater”. 

It has a “significantly lower carbon footprint compared to conventional animal and synthetic options”, creating 0.8-2.1 CO2e per square metre (based on a Life Cycle Assessment study commissioned by NFW). Petroleum-ba…