Desert boots 90s model, something sticky inside?

[pawtwo]

Well,

 

At least I found a factory new pair of 1993 made desert boots on Panama soles in size that I can use. These aren't really easy to find here.

 

They are originally boxed and have DLA100-93-D-4145 contract.

 

I discovered that there is something powdery, yellowish and a little sticky inside on "coolmax" cloth in upper part.

 

Does desert boots were treated with something like this for any reason (sweating etc) or It's just a kind of glue that deteriorated over time?

 

[Martinjmpr]

Soldiers were issued foot powder for sweating, my guess is that it was probably an insole or something else that, as you said, deteriorated over time.

[pawtwo]

It seems that it's a rubber from outsole manufacturing proces that is all around here and there.