Let’s say you drive a Prius and belong to a club with an Audubon-certified course. Do you really want to show up in a shirt with technical fabrics that are derived from petroleum?Consider instead the new Tehama Everest Polo ($65, tehamainc.com), made of 50 percent cotton and 50 percent bamboo, which has demonstrated impressive performance characteristics. Bamboo fiber has tiny micro-holes that allow moisture absorption and ventilation when woven with other yarns, creating a luxurious fabric that wicks better than cotton and is two degrees cooler to the touch—with no addition of synthetics or polyester. It also has natural antibacterial properties, gives UV protection of thirty and traps odors. Since bamboo grows like a weed (up to a foot a day) and can be harvested without replanting, you won’t feel guilty about consuming nonrenewable resources. Best of all, when you’re done with the shirt, it will biodegrade in just five months.