Unlike Ultraboost 4.0, these are the 5.0 and run much more snug on the top of the toes. I would say size up at least 1/2 size unless you like it very snug on the toes. It will stretch out after some time however. Also there's not as much cushion in the soles like the 4.0.A little smaller than expected. But a fine shoe for daily work / playReturned as two pair were 1/2 size smaller than normal ultraboost sizes worn by us.I've purchased several pairs of running shoes over the past year training for 1/2 marathons and marathons. I typically buy Asics but, based on a recommendation from a salesman at a local running store, decided to give the Ultra Boost's a try. They are like walking on a cloud. Not a messy, squishy cloud but a soft cloud. They also provide ample arch support for me. One thing that was very different was the fit - these are very snug, like a sock. Wearing thick socks would be uncomfortable. The toe-box is snug but the whole shoe is designed to fit like a glove, so that is to be expected. They are also the lightest shoe I have ever worn. There is plenty of cushion at the heel and less in the mid-foot forward. I think the shoe is just right. I got solar yellow and have been easy to pick out of the running crowd at events. If you have wide feet, I don't think these would work.I've owned a couple pairs of UB's at some points. These are the 1.0's, for those sneakerheads out there (Black/Black/Solar). Snagged them in Sz 12 at retail. They're just a bit tight overall, but that's because they're a sock/shoe runner style, so I can get over it. Not as much flexibility in the primeknit as the 2.0 or the 3.0, but a waay better pattern. They are legit, but just like any shoe always check to confirm.Lose 1-star solely because box has light damage and some areas on the shoe had light glue expiration, but it's to be expected for a shoe that's 2+ years old. I believe I got quite the stealYes , the comfort is there, blah blah blah, don't get me wrong, or ignore what the people say - this shoe is really comfortable. You could be on your feet all day with these and not feel tired after.The problem I have with this shoe, is the fact that it is advertised as a "running" shoe, and people are falling for it hook, line, and sinker. All the name brands like Nike and Adidas really take advantage of the names they have built with their quality products WAY BACK when, that they get away with saying their products are top of the line when they don't hold a nickel to the tried and true speciality running shoe brands of today.Running shoe? I mean, if you're just gonna run a single mile at a leisurely pace. However, if you're a runner who really puts in work, as in more than 5 miles on a constant basis, AVOID these. Your money will be better spent elsewhere.Picture included : plastic "cage" in the back has bent from the less than 2 weeks that I have had these shoes in running. With less than 70 miles running on them.COZY! These shoes fit super snug, so wear thin socks as they are super TTS and do not have much room for thick socks. Your common cotton sock is already too thick, use a runners sock for the best fit. At first I thought of the Boost technology as a gimmick, but after having these on feet, I was very impressed. These are so cushy and they feel like you are walking on soft foam all day long. Those boost beads are a god send. I highly suggest them. The only thing that I did not agree with are the traction treads, if you are near anything wet there's a chance you may slip.This is one of the best cushioned shoes I have worn till date. I mainly run on treadmill about 3-4 mile/day. Have used it for about 25-30 miles so far and feels really good. I bought 1 size larger as i usually like little room and i guess ultra boost shoes are little narrower than others. I tried Aspics Nimbus-18 before I bought this one but returned it back. Although slightly expensive shoe but if you are looking for cushioning its worth a try.