This universal diffuser has a unique 'twist, fit and grip' mechanism which allows it to fit hair dryers with a nozzle circumference of between 10.5cm to 24.5cm.
 
So far, we've had it on a Shark, a Dyson, a Laifen, a GHD Flight+, a Remington, a 3Q & a 5Q, a John Freida and a Parlux. 
 
No need to travel with your hair dryer, because this diffuser will likely fit any hair dryer your hotel would supply! The diffuser also comes in a (deliberately oversized) canvas drawstring bag, that has a little extra room to hold all your hair accessories when travelling (or store your diffuser when not in use).
 
Many diffusers have a very closed range, meaning substantial air from the dryer is blocked and users will crank the fan speed on the dryer much higher (and much louder) to get more air flow to speed up dry time. Whilst still effectively diffusing through the wide mouth, the Just Like Betty DIffuser allows more air to flow, meaning you can turn down the fan speed (and the noise!) on your dryer. 
 
Caution: Please see your specific dryer manual for information - some hair dryer brands will void warranties for use of alternate attachments. Just Like Betty also recommends using no higher than medium heat settings or below, to avoid overheating your hair dryer. Just Like Betty will not be responsible for any misuse, overheating or damage to dryers.