KONRECOFR Shirts for Men Button Down Flame Resistant HRC2 Men's Welding Shirts

Is this thick or thin material? In other wards would it make you hot during the summer ?

I'm 5'10" and ~165lbs. What size would you recommend? Any experience?

I notice a big red dot on the top of pocket not sure if it’s just a sticker or a patch. Does anyone know what it is??

How are the FR shirts to be washed?