Cotton: 48%, Viscose: 52%

From the KnitSMC website:
SMC Select Reflect has contrasting bright and matte sheen which looks great when knit for elegant, feminine designs. This yarn can show textured stitches and lace very well -- adding a touch of glamour to a special knit or crochet design.

Care instructions:
Machine wash at 30 degrees - gentle cycle
Do not bleach
Do not tumble dry
Dry flat
Steam iron at low heat
Can be dry cleaned