I really didn't like any of the other designs so I created this one.
Items you need:
Nike + Sensor
3/4 inch shrink wrap tubing
2 Large Nails
Paper cut into shape of a triangle
Shoes with laces
Step 1: Checking the Shrink Tubing
Step 2: Marking the Sensor Direction
So I took the time to cut out a paper triangle and tape it to the sensor with the triangle pointing up with the apple upright.
Step 3: Making the Holder
Remove both nails and thread a nail through the holes.
Insert the Nike sensor into the other end of the tubing.
Cut the tubing so both ends have equal length from the Nike sensor.
Then puncture the newly cut end exactly as before.
Step 4: Shrinking the Tube
I moved the flame around the tubing never leaving the flame in one position for too long.
Once done and cooled you can remove the nails. The result is a nice hole for your laces and a waterproof holder.
Step 5: Lace It Up
Since my holder and shoes are black, the sensor is barely visible.
I love this holder and have had no issues what so ever.
I also don't notice the sensor at all since it rides above the tongue.