Our fabric linings come in cotton, poly or a cotton/poly blend. Blackout linings include Blockout (a room-darkening blackout lining with a luxurious 100% cotton face) and Specialsuede lining, which darkens and insulates somewhat without adding bulk. Interlining or bump cloth can be added between face fabric and lining to provide insulation, protect your fabric or create luxurious fullness.  Match the fiber content of your lining to your face fabric to avoid shrinkage issues and puckering. Consider the lining color as viewed from outside and how the color may affect the face fabric color when sun shines through it. If in doubt, opt for white lining that helps preserve the original color of your decorative fabric.