Hand towel thickness is measured by weight and that is measured by GSM, or grams per square meter. Once you understand GSM, it will give you an idea of how thick and absorbent the hand towels are.
A thick, plush, and heavy hand towel will have a larger GSM than a thin one, and a less absorbent hand towel will have a lower GSM. Here are some general guidelines to follow when choosing your hand towels:
300-400 GSM This is the weight of thin lightweight towels, not suitable for a bathroom.
400-600 GSM Medium weight hand towels, perfect for everyday use and kids' bathrooms.
600-900 GSM This is the weight of the thick, high-end hand towel that you will use for special events and for a sense of luxury.