What I notice is the crew neck, which is cut to avoid any choking sensation.
July 4th Patriotic Cat Smoking Cigarette 250 Years Cat Lover T-Shirt
You will find the crew neck is just loose enough to let air circulate well.
Moirai The Fates Greek Mythology T-Shirt | Ancient Greek Goddesses Tee
This black t-shirt is a classic choice that never goes out of style.