It's OK for the money. I got a medium (two of my hats are medium) but this one was way to tight so had to return it. I would have ordered a large except that the fastening under the chin was a button which went into a slit in a piece of ordinary elastic about 15 mm wide by 40 mm long. This was pretty shoddy and will almost certainly give way with use.
This was bought for dog walking in the cold weather and boy is it cosy. The size is very accurate and my ears and head stay lovely and warm. The fur lining is quite thick and the hat comes low enough at the back to give your neck some protection. An excellent buy.
Great looking, warm, soft and very comfortable. What more can one ask for? This hat is my everyday hat for cold weather. FYI, the flaps, when not in use, are tethered with buttons, (rather than velcro). I erred towards the larger size, when unsure about size/fit, and that was, for me, the right 'error' to make.
Had to buy a secret santa for the son in law and within the cost this was a very good deal. As he stands waiting for a bus his little ears get cold so this was perfect. Also it is waterproof which has been great for the weather. Overall exactly what it says on the tin, very good value for not a great price