Patagonia Primaloft Insulated Nano Puff Quilted Pants. Men’s Large, Gray
Great for wearing under waders in cold season
From REI :
“Ultralight polyester shell fabric—with a durable water repellent (DWR) finish and a reinforced seat—slides easily in and out of waders.
60g PrimaLoft® Gold Insulation Eco synthetic insulation offers toasty, puffy warmth that sticks around even if pants get wet
Elastic waistband and belt loops secure the fit along with the button front and zip fly
Zip fly, front pockets and rear zip pocket provide easy access and storage; in other words, these pants work just as well in or out of waders or wind pants”
$90 plus $8 for shipping, I will handle paypal fees  (note: no friends and family)

Thanks for looking : Vanne and Tom