The brand is Uneek classic which I've had before from another seller.
Not 'premium' quality (slight tendency to pill) but half the price of other branded (Nike) sports wear.
The best thing for me is that these (Uneek) tops are properly sized. Ordering clothes off the internet can be a bit of a gamble with different manufacturers having different ideas about what constitutes "large" and I've bought a cheap hoodie before from eBay which was supposed to be 3XL and I could barely get it over my head. I got this top in 4XL and it is massive (even on me) and so is perfect for mooching about the house and watching TV. Now I know what brand this is and how they are sized I'm ordering three more 3XL tops - ideal for sports or outdoor work, warm and well constructed.
Slight tendency to pill as observed from my older hoodie of the same make but even so I think this is a good product for the price and other manufacturers (Gildan, Fruit of the Loom etc) only go up to 2XL so I am happily buying more of these.