REI MTS shirts & pants

"These all-synthetic, no cotton clothes are a good first layer for any weather. They wick sweat away from your skin and don't get cold and clammy like cotton blend shirts do. They resist odors and wash/dry quickly and easily. They're really soft and comfortable, making for good sleepwear. They come in light and medium weights; both are good. Cheaper than silk and Capilene and widely available (just order them online at REI.com)."