Blended quilt batted simple means that two different types of quilt batting material are combined to make a blended quilt batt. Some of the most used fibers for this is cotton and polyester or simply poly.
Bamboo fibers and silk fibers are used quite often. The blended is usually 80% Cotton and 20% polyester. Some companies offer 70% Cotton and 30% Polyester. Just take a look under this category to see many different blended quilt batts.