The best of both worlds. They're not as fuzzy as you would think...very thin fuzzy stuff but its perfect for everything. I was looking for a slip-on to wear to sporting events. I get too hot from all the cheering so this is perfect because it's airy yet warm while walking to your car. I am a size 7.5 but always order size 8 because my feet expand by the days end. I ordered these an 8.5 cuz I would wear socks, not trouser socks, but thick socks with them. They are very loose but I didn't send back because I have worn them already and I LOVE them. LOVE, LOVE, LOVE them. I would have been good with a 7.5.  Also the color...black and grey so all your active wear, even jeans, will look good. I highly recommend them, my highest recommendation.