I love the Worsterlon Shirts sold by Cabelas. They're a synthetic, and are great at letting moisture evaporate if you overheat. They are easy to take care of. You can just wash them out in a stream and hang it over a bush, and it'll be dry in 20 minutes because they don't absorb moisture: it will just drip dry. They also wear well (last long), look good, and come in several patterns and colors.
FROM THEIR WEBSITE:
Cabela's Worsterlon II Shirt – Regular
•Look, feel and warmth of worsted wool •Easy-wear characteristics of polyester •Moisture-wicking and quick-drying fabric
The shirt that set the standard for comfort, performance, durability and easy care is back! Crafted of a Cabela’s- exclusive fabric, the updated Worsterlon II Shirts have the look, feel and warmth of worsted wool paired with the easy- wear characteristics of 100% polyester. The fabric is itch-free and doesn’t hold odors. Wear after wear, wash after wash, you’ll swear this shirt never ages. Best of all, it wicks moisture and is quick-drying – just wash it and hang it up or tumble dry. Features: corduroy-lined collar band and cuffs, double-needle stitching, double yoke and two button- through front pockets. Machine washable. Imported. Sizes: M-2XL. Colors: Desert Tan, Mallard, Pine Ridge. Plaids: Crimson Red Plaid, Desert Tan Plaid, Light Olive Plaid.