Hi I am for some years now still searching for some tough synthetic insulated pants to put over regular pants when less active / stationary.
I bought some Paramo Torres trousers size medium, they fit me when I'm not fit but if I'm recently well exercised my thighs are too big and I can't bend or sit down in them. Cyclist's fit problem.
Funny the Paramo Velez pants have the thigh room but baggy lower leg.
I don't want to go up to a size large as my belly isn't that big and I'd be carrying excess fabric.

