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Shelf life of EVA in trail shoes?
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David Poston
(dgposton) - F

Locale: Texas / Colorado
Shelf life of EVA in trail shoes? on 03/31/2013 12:11:54 MDT Print View

I keep reading information on the internet about the EVA in shoes breaking down. Is there any scientific evidence to support this? I love my Brooks Cascadia 5's, and was looking at picking up several pairs on the cheap. I'm sure many of you have done this--what has been your experience, does the cushiness go away? The shoes are probably about 3 years old now, which means that I'd be wearing them when they are 5 years old or more.

I'd like to see BPL do some scientific studies on trail shoes to help us sort out rumor from fact.

Max Dilthey
(mdilthey) - M

+1, any scientists out there? on 03/31/2013 14:02:56 MDT Print View

Also interested. I just got some Salomon hiking runners and I'm wondering when I'll be dropping another $125. I've had three surgeries- I can't risk having no absorption 100 miles from home.

Roger Caffin
(rcaffin) - BPL Staff - MLife

Locale: Wollemi & Kosciusko NPs, Europe
Re: Shelf life of EVA in trail shoes? on 03/31/2013 14:42:30 MDT Print View

To the best of my knowledge ...

The EVA breaks down under load and humidity. You will often find that the area under the heel and under the ball of the foot gets hollowed out.

I have EVA sheeting on the shelf which has been there for 5+ years without any noticeable degradation. So I don't think you should have any problem with stored NEW shoes.

> some scientific studies on trail shoes
Interesting idea, except that all the major companies cycle through models every 12 months. I think they also update the technology every year or two. You would need to do some accelerated aging - for which I do not have the necessary lab facilities. :-)


Max Dilthey
(mdilthey) - M

Not me! on 03/31/2013 14:51:53 MDT Print View

Let's not forget, turns out the shoes I just bought (Salomon Speedcross 3) use three different densities of EVA. Lab testing would be a nightmare.

Willie Evenstop
(redmonk) - F

Locale: Greater Yellowstone Ecosystem
Shelf life of EVA in trail shoes? on 03/31/2013 14:53:16 MDT Print View

$20 on the adhesives holding it all together fail with aging.

Bradford Rogers
(Mocs123) - MLife

Locale: Southeast Tennessee
Re: Not me! on 03/31/2013 15:37:15 MDT Print View

I get between 500-700 miles per pair of my Salomon XA Pro 3D's. I am on my 5th pair and I find that by that time the outsole is well worn but the lining inside the shoe is the first thing to go along with two holes in the fabric in the flex point of the shoe (seems to be a deal with this shoe).

I replace my running shoes (road/treadmill) every 500 miles and can tell a big difference in cushioning even though the sole and upper can look brand new (particularity if I have done a lot of treadmill running). I buy multiple pairs of each shoe I like as they seem to change them just as I find one I like. I have noticed no degradation of shoes when stored indoors unused.