If it's ease and practicality that you're seeking in an outfit, consider teaming a grey hoodie with grey sweatpants. White athletic shoes will never go out of style.
Grey Hoodie with Grey Sweatpants Relaxed Cold Weather Outfits For Men
For comfort dressing with a contemporary take, wear a grey hoodie with grey sweatpants. You could take a more elegant route in the shoe department by rounding off with a pair of white leather low top sneakers.