What GSM should I look for in a bath towel?

Across the reviewers we read, 500–700 GSM is the sweet spot for everyday plushness and absorbency, while lighter 600 GSM and Turkish-style flat-weave towels (often quoted lower) trade some loft for faster drying. Very high figures like 820 GSM feel luxurious but reviewers note they take longer to dry and, in at least one premium case, drew durability complaints.