Best bath towels: six compared, and 90 per cent of Egyptian cotton is not Egyptian

GSM is the only real specification, so start there and be suspicious of anyone who withholds it. Grams per square metre measures the density of the pile. As a rough guide, 300 to 400 gives a thin, fast drying towel of the sort you want in a gym bag; 400 to 600 is an everyday bathroom towel; and 600 to 900 is the heavy hotel weight. Divide the price by the GSM and you have a value figure that ignores the branding entirely. In this comparison that runs from 0.0286 to 0.0500, and the towel with the best figure is not the cheapest and the one with the worst is not the dearest. Two of the six do not publish a GSM at all, including one costing £26.

Learn which fibre words are controlled and which are decoration. Supima is a licensed and audited trademark for American grown extra long staple Pima cotton, so it means something specific. Egyptian cotton is certified by the Cotton Egypt Association, which verifies by DNA testing and maintains an accredited list, but the phrase itself is not policed on a shelf: the association’s own head told Reuters that around 90 per cent of global Egyptian cotton supply sold in 2016 was fake, in the aftermath of a major supplier being caught mislabelling cotton sold through Target. No UK retailer we checked appears on the accredited list. Turkish cotton is a description of origin with no certifying body at all. Combed, zero twist and long staple are descriptions of process.

Bamboo is not a permitted fibre name. We read Annex I of the assimilated textile labelling regulation, which carries the closed list of fibre names you may lawfully use, and the word bamboo is not in it. Viscose is entry 25 and lyocell is entry 33, defined by process rather than by feedstock. So a towel or sheet sold as bamboo should be declared as bamboo viscose, or viscose made from bamboo. This is not a technicality: viscose is a chemically regenerated fibre and lyocell recovers most of its solvent in a closed loop, so the process is where the environmental difference sits, and calling both bamboo hides it.

Ask for the certificate number, not the logo. OEKO-TEX Standard 100 issues numbers and MADE IN GREEN issues a product ID whose entire purpose is letting you trace which certified facilities made the item. Of six towels here, one publishes an ID, one names its institute without a number, one claims three separate schemes and publishes no number for any of them, and three claim nothing. If you are paying a premium for a certification, the number is the thing you are paying for.

Understand the trade off between soft and absorbent, because the brands admit it. Fabric conditioner works by depositing a thin waxy layer on the fibres, which is what makes fabric feel soft, and that layer repels water. So conditioner makes a towel feel lovely and stop working. John Lewis says so in its own care copy. Soak and Sleep goes further and says avoid it entirely because it coats the fibres and reduces absorbency over time. Many new towels also ship with a silicone finish that does the same thing, which is why a brand new towel often pushes water around rather than soaking it up. Wash a new towel once or twice before you judge it, and never use conditioner on towels.

Beware the zero twist trap. Zero twist yarn is spun so the fibres lie parallel rather than twisted, which produces an exceptionally soft, plush feel and is marketed hard on absorbency. In practice these lines attract a disproportionate number of complaints about not drying you. One 600gsm zero twist towel we looked at, sold specifically on quick absorbency, has ninety reviews at two stars or below, including an owner who washed them twice with no conditioner and returned them because they still would not dry her. Soft and absorbent are not the same property and the marketing routinely conflates them.

The smell is bacterial, and there is a named organism. The musty note a towel develops is not detergent residue, it is largely Moraxella osloensis producing 4-methyl-3-hexenoic acid. Japanese researchers publishing in Applied and Environmental Microbiology found it on 52 per cent of dried towels at over 10,000 colony forming units per square centimetre, and crucially it survives drying. A separate 2021 model found malodour peaking after about seven days damp. The practical answers are all about drying rather than washing: hang towels spread out rather than folded, ventilate the bathroom, and do not leave a damp towel bunched on a hook.

Wash hot enough and less often than the internet tells you. Temperature is what kills the organism rather than merely diluting it, so a 60 degree wash on towels is worth the energy in a way it is not on most other laundry. Heavy towels take longer to dry, which means more hours damp, which is the actual driver of smell. That is a genuine argument for a 500 to 600gsm everyday towel over an 800gsm one if your bathroom is small and poorly ventilated, whatever the luxury framing says.

And accept that nobody publishes absorbency data. We looked. No UK retailer, brand or consumer body publishes original absorbency testing for towels. Every claim about how well a towel dries you is the maker’s own or an owner’s impression. On the single function a towel exists to perform, there is no independent evidence available to any buyer in this country. Buy on weight, fibre, price per gram and whether the certification can be checked, because those are the things that can be verified.