With the fall weather coming, I wanted to get some dedicated "technical" sweatpants for the gym, as opposed to wearing my thicker cotton fabric sweatpants. The Nucleus sweatpants fit the bill perfectly. First off they are extremely comfortable, So comfortable, that I bought these for the gym but may also use them as home "loungewear". Though its all polyester, the fabric is silky and non itchy.
I usually am a small or medium in men's clothing, so I ordered the medium and they fit perfectly; not at all loose or baggy but it gives you enough room. I will say if you prefer these to fit almost like tights then get the smaller size.
They are extremely lightweight in terms of weight and warmth. Though they are extremely comfortable to wear around the house, they may be too light for the winter months in terms of warmth. If you are the type who wears shorts in the winter inside, keeps your room heating pretty high or live in a moderate winter climate, these may be perfect for around the house. Overall I highly recommend these!