The Strength Co. sweat pants our made of a very heavy fleece and will provide you with warmth in temperatures as low as 50°F (10°C). They are roomy in the legs and great for lifting or lounging.
These are my favorite new pair of sweat pants. Got them in (L) and they fit perfectly. Not too tight, not too baggy, and the elastic around the ankles is great. Back pocket because why the heck not! These are heavy enough to keep you warm, tough enough to lift or do yard work in, but also comfortable enough to just hangout on the couch in. I live in the Mid-Atlantic where a good pair of sweatpants can make a huge difference on those rainy/snowy/cold days and these are the ones I am going to be grabbing at for quite some time.