HanesMens Cotton, Moisture-wicking V-neck Tee Undershirts, Multiple Packs And Colors, White, Large US

Is it the red label t-shirt?

just bought some Hanes and they are flimsy material. I'm looking for the good old heavier material to keep me warm in the winter, which are these?

What is the weight of the package?

I generally wear a medium shirt but i ususlly oreder large tees because i have a bit of a belly. are therse slim fit ?