This is rather nice. Weighs just under 200g. Treated with Insect Shield (Permethrin) insect repellent which should last for the life of the shirt. The material is a polyester/polyamide blend with a seersucker weave so it has an almost silky feel to it. It’s supposed to be very quick drying. I’ve no idea how smell resistant it is, but it should be easy to rinse through regularly. Instead of buttons, it has snap fasteners, so no buttons falling off. Smart enough that you won’t get thrown out of the members’ stands at Lord’s but casual enough to wear backpacking. I like it! Rohan Sentry Shirt
Disclaimer: purchased with my own money and I have no relationship with Rohan.