Question for the shoe folks out there. Is the EVA foam in running shoes temperature sensitive, i.e. significantly stiffer in the cold. My metatarsals hurt on my cold weather runs, but not so much on the treadmill or indoor track. I’m trying to decide if its b/c I run longer when I run outside or due to the cold affecting my shoes or my feet. I seems to start after 30-45 minutes and does not linger much after I’m done. I have have had on/off metatarsalgia and use orthotics that seem to help.
everything is eventually “cold sensitive”, even mercury can freeze … 
There are many different outsole materials/properties, but yes materials like EVA, rubber, etc. do change when cold. Just how cold are you talkin’? I think they give durometer measurements of the materials at 1 ATM and 70 degrees F.
Yes. But for me it was usually offset by the fact that winter runs were performed on packed snow which itself was resilient.
Yes, EVA will react to the cold AND heat. Newer midsole materials (Mogo, BioMogo…) Will not get as squishy with the hot and not as stiff with the cold.
Eric
cold = 15-20F.
Funny you should mention this. I’ve had more arch discomfort running in the cold. And it usually set in about an hour into my long runs…about the time I would expect the shoes to really start getting cold. I’m no materials expert but it makes sense.
Asphalt and concrete are also harder and less resilient when frozen.
David K