How can I test gloves for long ride comfort? Preface: for about 15 years I have used always the same pair of gloves, which worked as a charm. Since they started to show their age and that version is since long time no longer produced, I looked for another pair. 

I tried one, which had a padding in the palm, and they felt comfortable on my hands. Only after wearing them a few hours on the ride I noticed the padding, pushing on my palms, made my hands numb, so I had no other choice than not wearing them.

Is there a way to assess gloves comfort in the few minutes one can try them in a shop?
When testing for something, you wanna make sure you are providing the similar environment for testing as for use.

Exhale some warm moist air on handle-like things, make sure you warm your hands up to the maximum extent by rubbing vigorously, hold them firmly for next 5 or so mins (doesn't matter riding or not).

This'll let you judge 3 things basically:


How they deal with sweat, is the grip impacted!
Is the cushioning sufficient, because we generally don't make such tight grips continuously while riding.
When you remove them and touch their palm side with bare hands, their temperature will tell you about material too. if they're properly ventilated or not.