For a green spin on the conventional plastic office chairmat, St. Louis–based Anji Mountain offers chairmats made of sustainably harvested bamboo from China’s Anji Mountains. The 5mm-thick mats are made of 2"-wide slats and range in size from 36"-by-48" to 55"-by-57" chairmats, and 42"-by-48" to 72"-by-48" rectangles. Choose from a natural bamboo finish or a dark cherry finish.