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How do the Various Plastics React in the Cold?

post #1 of 4
Thread Starter 

Flexing a boot on the carpet is one indication of stiffness, but with so many new plastics and fusions, I was wondering if any of the boot experts would comment on how the different materials react, or stiffen, in the cold?

post #2 of 4

all plastics react slightly (or massively) differently as temperature changes, all manufacturers are trying by engineering shape and flex , and by using different plastics to find the most consistent flex in their products, it is impossible to know how an individual will flex a boot in the cold as each person is an individual and has differing strength, mass, technique and lever length

 

what i do want to see is that someone can flex the boot well in the store, knowing that it will stiffen in the cold but that they will have a ski attached to their feet and therefore have more leverage, whilst the two won't cancel each other out in most cases it will work  

post #3 of 4

Not certain I agree that ski length has any leverage effect that should control flexion of boot in the store versus on the hill as long as the boot is kept flat in the store.

 

That said plastics react differently and different constructions make boots react differently to the change in plastic stiffness, so in general what CEM said works.  If the boot is very difficult to flex in the store it will probably be too stiff on the hill.  If mush in the store, probably mush on the hill.

 

If firm in the store it will either be correct on the hill or slightly too stiff but within a range that can be softened by the shop.

 

Lou

post #4 of 4

The best method in the store is to step into a binding on a ski simulator.  With the heel lug of the boot being held, awareness of flex is keen.  All injected thermoplastics are temperature sensitive.  Higher quality boots generally have additives in the plastic to reduce the impact of temperature variation.  

A boot glove insulates the shell and reduces the impact of temperature.

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EpicSki › The Barking Bear Forums › On the Snow (Skiing Forums) › Ask the Boot Guys › How do the Various Plastics React in the Cold?