What is the best backing for a Tshirt quilt?

What is the best backing for a Tshirt quilt?
Materials Used to Back a T-shirt Quilt

100% Cotton. This is my preferred fabric choice because it wears well and is easy to work with.
50% Polyester/50% Cotton.
100% Polyester.
Flannel.
Minky Fabric.
Polar Fleece.
Bed Sheets.
Typical Colors.

Materials Used to Back a T-shirt Quilt
  • 100% Cotton. This is my preferred fabric choice because it wears well and is easy to work with.
  • 50% Polyester/50% Cotton.
  • 100% Polyester.
  • Flannel.
  • Minky Fabric.
  • Polar Fleece.
  • Bed Sheets.
  • Typical Colors.