What's the difference between flannel, sherpa, and faux-fur heated blankets?

Flannel heats up faster and feels lighter, sherpa adds plush insulation and retains heat longer once unplugged, and faux-fur (often faux rabbit) is the heaviest and most decorative but can be harder to wash. Reviewers note that double-sided flannel-and-sherpa designs offer the best of both, while pure faux-fur is more of a couch throw than a sleeping blanket.