Summary: Every flight worse than the last, and I'd started wondering how many long trips I had left. Turns out I had the wrong explanation entirely.
1

Airlines Took the Padding Out of Economy Seats

Thin economy seat cushion stripped of padding

Not gradually by accident. Deliberately, to save weight and to make business class look worth four thousand dollars.

What's left is a couple of centimetres of foam over a frame.

2

The Padding On Your Own Body Got Thinner Too

Illustration of natural cushioning thinning with age

The natural cushioning on your backside thins as you get older. That part genuinely is your age.

It only became a problem because the seat lost its padding at the same time.

3

Your Weight Lands On One Small Area, Not the Whole Seat

Pressure map showing weight concentrated at base of pelvis

Sitting doesn't spread your weight out. Almost all of it concentrates on a small patch at the base of your pelvis.

Less padding on you and less under you means that patch takes everything.

4

The Pressure Builds the Longer You Sit

Pressure building over hours in an economy seat

Hour nine isn't twice as bad as hour four, it's worse than that. It accumulates, which is why long haul destroys you and a two hour domestic flight doesn't.

By the time you land it has already turned into all of this:

  • Buttock & Hip Pain
  • Lower Back Pain
  • Poor Circulation
  • Constant Shifting Fatigue
  • Numbness & Tingling
  • Muscle Strain
  • Dead Legs on Landing
  • Leg & Knee Pain
5

Everything You Have Tried Treats the Symptom

Traveller standing in aisle to relieve pressure

The aisle seat, getting up every hour, the ibuprofen before boarding.

None of them spread the weight out, so none of them change what's actually causing it.

"She hadn't moved in six hours. I'd been shifting every twenty minutes since takeoff. Same seat, same flight, and she was twenty years older than me."
6

Foam Cushions Fail Exactly When You Need Them

Flattened memory foam cushion after hours of use

They feel great at takeoff and bottom out by hour two.

In one study memory foam scored second worst of everything tested, beaten only by sitting on the bare seat.

7

What Actually Fixes It: The Cushy Bum

Cushy Bum air cell travel cushion

It was never your body failing. It was two kinds of padding disappearing at the same time, and nothing you tried put either of them back.

That's what the Cushy Bum is for. It's a travel cushion made of sealed air cells. When you sit on it, the air moves underneath you and spreads your weight across the whole seat, instead of letting it all press into one small area at the base of your pelvis.

Because it's air and not foam, it can't crush flat halfway through the flight. The built in pump lets you set the firmness yourself, and it packs down small enough to live in your carry-on.

I took it on a 14 hour flight to Tokyo. No pain, I actually slept, and I was out exploring the day I landed instead of lying in the hotel.

Business class upgrade $3,000+
Medical seat cushion (that stays home) $400
Single physio session after a bad flight $150
Cushy Bum — works on every flight, forever Under $100