Being comfortable while flying is a non-negotiable for most people.
Personally I wear my crocs everywhere - and get ridiculed for doing so - whether it be at work or on a plane.
However, a flight attendant, who spends most of their time in the air, has revealed why you should keep your sliders in the suitcase.
American Airlines flight attendant Andrea Fischbach has explained why high heels and backless sandals are a no-no on flights.
She told whattowear.co.uk that these shoes 'make it difficult to quickly evacuate the aircraft'.
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"Heels can possibly cause further damage to emergency exits or hurt others if they go flying off somehow," Andrea explained.
"I would really advise against high heels or flip-flops or any slides, mostly for safety purposes.
"If there is an evacuation and slides are required, your high heels will have to come off, as they can puncture the slide.
"Who knows where and in what conditions you'll land.
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"Plus, they aren't very practical running gate to gate."
But what about flight attendants in their heels?
Andrea claims that even on-flight staff change their heels after take-off due to impracticality.
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"As if another reason is needed, they make the metal detectors go off (if you are lucky enough to have pre-check) thanks to nails in the heels," she said.
"Flip-flops and backless shoes can also end up flying off your feet, and your feet are more likely to freeze, especially during a long flight."
Also when going to the loo mid-flight it's probably not the best idea to go in your slides.
"Be wary of wearing sandals if you are planning on going in the lavatory," Andrea warned.
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"That isn't water on the floor (yes, use your imagination), and sandals invite whatever that liquid is to splash on your feet."
Another comfy choice a lot of us consider when flying are leggings.
But according to one expert, you should never wear them while travelling.
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Aviation expert Christine Negroni told The Sun: "You might have to escape through a cabin fire or there could be a separate fire on the ground once you leave the aircraft.
"Everyone is wearing yoga pants on planes now, but I avoid all artificial fibres because they are more likely to burn and stick to you if there is a fire.
"I’d advise wearing cotton clothes or anything made of natural fibres."
Anish Vij