Ok, so I've had my digger hat for a week or so. Temperatures here in Eastern Vic have been between 15 and 20 C in that time. I found the lining on the inside of the hat to be quite hot and sweaty against my nude nut. Is it plastic, rubber or vinyl? The sweat does not permeate to the outside as it does on my other hats. I'd suggest that if the inside of the hat was a single layer of canvas like the brim, it would be a lot cooler. Most sweat stains if they reached the outside would/should wash out...