Don't waste your money.
I had been cutting an old foam roll mat up to use as insoles. Each time I did the insoles I'd made lasted about a month before becoming useless. I weigh 12 stone and am on my feet in walking boots for around 8 hours per day.
I bought these Grangers insoles hoping for more longevity and more comfort.
Comfort wise there is no difference between these and a bit of old cheap foam mat. However, the FOAM MAT lasted longer! !
Within a week the Grangers insoles had compressed permanently to wafer this rendering them utterly useless.