I also wear a Tilley, the exact one in Subsonic post. 🤓
I think it is a T5, the cotton duck material. I like that better than the ventilated polyester ones. It soaks up sweat better. Just toss it in the wash fairly often. Yeah they are expensive, buy once cry once applies in this case. I think they still have a lifetime warranty.
It’s a good Christmas list item, something you’d like but hate to buy yourself. I have two of them.