I looked around for a heated insole or sock and found that almost all my choices were either too expensive, too bulky or both.
Most of the time I have issues with my toes I am near a computer, so I figured there must be a way to heat my cold toes via USB. I looked around for USB Foot Warmers and found a website selling cheap slippers with heated inserts in them.
I ordered the slippers (pink bunnies) for 10 dollars and awaited my package!
Opening the package and plugging them in I realized this isn't a solution, the slipper has cardboard and fur between the heating element (a heated fiber type material) and the actual bottom of the foot and the heat just didn't get to where it needed to be.
Then it hit me...
Take them out of the slipper, and rig them to my insoles so I can insert them into any footwear I own.
Step 1: Getting Your Materials Together
1. Heated Slippers from DealeXtreme.com - $10-14 US
2. USB Extension Cord. - $2 US any where.
3. White Electrical tape. - $1 US Home Depot
4. Duct Tape. - $1 US Home Depot
5. Your sneakers.
Step 2: Remove and Prepare Heating Elements
Depending on the slippers ordered the heating element will be different shapes.
I ordered two different slippers (because I have a tendancy to screwup) and one set of heating elements were rectangular opposed to square which for my purposes suited me fine.
Remove the heating elements from the slippers by unzipping the sides (most of the slippers have zippers, if yours does not just cut them open carefully)
Cut the USB port off the end leaving aproximately 1 to 2 inches.
This will leave you with the heating element(s) and a short USB plug.
Note: If you want quick and dirty, you do NOT have to cut this wire, you can just plug it into a USB port once you have followed the rest of this instructable, but I recommend you do cut it so you can customize the length and utilze the secondary heating element.
If you are lucky enough to get a wire that has been molded together you'll be able to seperate both heating elements just by pulling the wires apart. if not just trim each where you will have some extra length to work with.
Step 3: Attach the Heater to the Insole.
Once it is in the right position, use a small piece of duct tape to hold it.
Step 4: Insert the Insole and Thread the Wire.
Me I just wanted it simple.
Step 5: Connect the Wire to a USB Plug
You should have wires coming out of the shoe and wires coming off the USB tip you cut off earlier. Strip them each back by an inch or so and make the connections.
Connect the RED to RED and BLACK to BLACK
Twist the red and red together so it makes a solid connection and do the same with the black, they need to be mated, not just touching.
Secure the connections with the white electrical tape, shrink tubes or liquid electrical tape, your choice, but make sure they are protected.
If you have other colors in your wires, snip them off or cover them with electrical tape.
Step 6: Pretty It Up and Plug It in for Warm Toes!
When ready plug it into a USB port for warm toes!
Now you have a portable USB heated insole that you can take out of any shoe, you can power it from any USB source, be it a computer, laptop, USB car adapter or wall wart adapter.
Step 7: Options!
You can mold the USB plug into the sole
You can glue it to the bottom of the shoe instead of the insole.
You can sew them into pants to keep your butt warm.
You can attach it to a sock.
You can fix the original warmer slipper.
You can do this to a set of gloves.
You can use a portable USB battery pack for on the go warmth.