I wish the Ultraboost 21s were lighter because I liked the feel and the form-fitting upper. The upper of the shoe is thick and more like a sock, which I like. It stretches to mold around your leg. I wouldn't say it's a high volume shoe but it adapts to your foot in a very comfortable way. There's a problem: unless your socks are very tight or too thick, they can clump together very easily. The heel itself is very flexible and has a tongue that helps when putting the shoe on. I'll admit there are times when I have trouble sliding my foot into the shoe and then I wish I had an actual strap, but at least the design has something built in. Overall I have nothing but amazing and enjoyable experiences with this particular style.
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