This piece uses a crew neck that feels sturdy but still flexible on the neck.
Port & Company PC61T Mens Big & Tall Short Sleeve Essential Crew Neck T-Shirt
You will find the crew neck is just loose enough to let air circulate well.
Port & Company PC54R Mens Short Sleeve Retro Ringer Crew Neck Cotton T-Shirt
The crew neck on this tee is a nice touch for those who hate collared shirts.