Nathan Speed 4 Review:

While perusing my local Runners Roost I stopped to examine their
fuel/hydration belts.  The Nathan Speed 4 caught my eye so I asked the
salesman his opinion on the Nathan Speed 4.  He told me he felt the
Nathan Belt was superior to the Fuel Belt and/or Amphipod Belt.

The first hydration belt I purchased was the Amphipod 2+ which featured
two 10.5 ounce water bottles.   The Amphipod belt uses a "snap in" feature
locking the bottles in place.  I never cared for this design and while running
I ended up loosing two bottles on two separate occasions when I thought
the bottles were snapped in; they were not.  I could never get a comfortable
fit with the belt and after a substantial time running, the belt would dig into
my side.

I eventually grew tired with the Amphipod and decided to purchase a Fuel
Belt Endurance 4.  Fuel Belt is the leader in the industry and I figured I
could not go wrong with a brand name item.  I purchased the Endurance 4
model with four water bottles each one capable of carrying 8.5 ounces.  
The fuel belt was comfortable, but I never found it easy to get the bottles
back into the elastic holder while on the run.

That's what caught my eye about the Nathan Speed 4.  Instead of using an
elastic material to hold the bottle they use a hard plastic cage.  This makes
sticking the bottles into the cage a snap while running.  The belt also
features two pockets. One mesh pocket in the back which can carry several
items and another small zipper pocket in the front for holding a key.  I've
also found the Nathan belt to be the most comfortable of the three belts
that I have tried.

Another advantage is that the bottles are 10 ounces, giving you the option
of carrying up to forty ounces of fluid.  I like the option of four separate
bottles as I adjust the number of bottles that I carry based on the heat, how
far I am running, etc.

In conclusion, I recommend the Nathan Speed 4.  It has a fantastic fit, it's
comfortable and it's easy to place the bottles back in the plastic cage
without breaking stride.
Nathan Speed 4
Amphipod 2+
Fuel Belt
Endurance 4