I LOVE LOVE LOVE THESE! NO HEEL SLIPPAGE WHICH IS AWESOME FOR A SLIP-ON BOOT! FIT IS PERFECT W/OR W/OUT THICK SOCKS. SHAFT IS SOFT AND PLIABLE FOR ANKLE FLEXING. THIS IS VERY IMPORTANT AND WHY I HATED COLUMBIA'S BUGABOO'S. THEY WERE LIKE WEARING WOODEN PLANKS! THESE ARE SO COMFY I FORGOT I HAD THEM ON-HAHA! RUN TRUE TO SIZE W/PLENTY OF ROOM WITHOUT BEING SLOPPY. THE ONLY DRAWBACK IS I WOULD NOT RECOMMEND FOR SOMEONE W/VERY HIGH INSTEP. IF YOU HAVE A "NORMAL" FOOT THESE CAN'T BE BETTER!
UPDATE 3/1/15: Have had these about 2 yrs. now. I won't say I've worn them to death but I've worn them a lot and they still look like fresh from the box. But I do take very good care of them cleaning & washing off salt. That said they have held up VERY well with no issues whatsoever and I can still wear these ALL DAY with NO discomfort. No pinching/rubbing/heel slippage etc. Usually a slip-on boot starts feeling sloppy with wear and slips but not these. Extraordinary quality and durability for the price! If temp drops below freezing and you will be outside for long periods you may consider something else as I don't think these will keep you warm...maybe with thick wool socks...I say this because everyone is different and MY FEET are pretty big cold sissies...these are great for long periods outside for ME if temp is above freezing.