I'm biased.
That said, HOLD FAST are great straps, made in Baltimore (designed and formerly manufactured in Brooklyn) by people I know, and they work effin well.
Similar idea of the PowerGrip or whatever, but better function in all areas. I use them on my commuter bike with Blundstones. I'm not cool enough to wear Vans, particularly when it's snowing out and they might clash with my fenders, but the HoldFast straps are awesome, particularly in the arena of stopping/slowing on a fixie. Lots more support than straps and cages of yore. You can also readily adjust them on the fly (lots of velcro there), as well as set and forget them. One winter, I had them on too tight because the pedals I had put them on were plastic, so I would slip unless I tightened them, so I tightened the hell out of them, bailed super hard on a hill of ice and gravel, and had to loosen them to detach myself from my bike. Awesome straps. You can also get them in safety-first colors like blaze orange or reflective. Rock.
http://holdfastordie.com