Extremely comfortable, very light, pretty airy and breathable, and they keep your foot temp moderate even in winter. They're good for standing on your feet for extensive amounts of time too. Nice open toebox area, plenty of room to wiggle your toes. They definitely smell a little chemical-y, and they are SUPER narrow (which is fine for me since I have narrow feet but people with regular or wider foot widths will need to take that into consideration). Pretty true to size, length-wise.