This 600L Thermo-King compost bin is made from 100% recycled plastic with patented Thermolen® technology. This technology thermo-insulates the compost, speeding up the process. Thermolen® properties provide high levels of insulation within the walls of the composter, retaining heat more effectively. In turn, this will hasten the composting process, shortening wait times and enabling you to use compost much sooner. Thermolen® is manufactured from 100% recycled polypropylene (PP) and can also be fully recycled if required.