In recognition of Earth Day, Sigma would like to announce that we are advancing our commitment to sustainability by switching from a conventional petroleum-based resin to a biomass-derived alternative for the production of our proprietary material, Thermally Stable Composite (TSC). We are certain with this switch that it will significantly reduce the environmental impact of Sigma's manufacturing processes. For further details please visit: bit.ly/Sigma-sustainability-advancement-IG #sigmaglobal #Earthday #sigmalenses