The round neck here is designed to keep its shape through regular use.
Gildan G200T Navy Blue Azul Ultra Cotton T Shirt G2000T Size XLT 2XLT 3XLT Z7
You will find that a solid T-shirt like this is a foundational wardrobe item.
Gildan G200T Black Ultra Cotton T Shirt G2000T XLT 2XLT 3XLT Negra Noir J1
You will find the round neck is comfortable enough for sleeping in this tee.
G200T Sport Grey Gray Gris Gildan Ultra Cotton T Shirt G2000T XLT 2XLT 3XLT Cami
A round neck like this works well under sweaters and hoodies alike.