Ladies razorback tanks are a soft ring spun cotton. They do run SMALL. They're meant to be fitted. I always recommend sizing up one. Some people will size up 2 for a looser fit.
Heathered colors: They're blends opposed to 100% cotton so the design will not be as bright as regular color Ts. It will have a bit of a vintage look.
Other colors: If you choose this option, please list your choice in the notes section. Also, other brands may be used to get as close as possible to your requested color.