Note: This is an independent project by Rick Budde
Simulated foot and thermocouples for warmth testing
Obviously, a winter boot needs to be warm. Being a SkiTestGuy, I naturally thought about how you would test and measure the warmth of a boot.
I developed a way to measure the internal temperature of a simulated foot. The simulated foot is 300 grams of water in two plastic tubes. A thermocouple is sandwiched between the two tube. The water is heated to 98 Deg F (body temp) then placed in the shoe or boot being measured. Then, the shoe and simulated foot is placed in a freezer at 0 Deg F. I measure the rate at which the water cools down. This tells me the ability of the shoe or boot to retain warmth.
Results of warmth testing: Minutes to lose 1 Deg of heat
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Warmth testing result: Temperature change vs Time
I have been unable to find a pair of winter boots that work well with my lifestyle. I want a pair of boots I can put into a clothing bag at ski races and not feel like I'm carrying around bricks. Traveling by airplane to go on ski trips has been especially difficult. Boots are not travel friendly.
I looked all over for a winter boot that would be warm, lightweight and easy to fold or compress into a suitcase or ski bag. I have been unable to find anything I liked. So, I'm designing and building my own line of winter boots. I wanted a boot that that didn't feel like a boot. I wanted it to feel like you weren't even wearing a boot. My wife suggested "NakedBootz" would be an appropriate name. So that's what it is NakedBootz LLC.
We are about 1 year into the project and are having samples built in a top-tier factory in China. We are planning a Kickstarter campaign in the winter of 2019. Please consider joining our mailing list to receive notification when the Kickstarter campaign begins.
How heavy is your shoe or boot
A typical running shoe is about 0.7 pounds
Hiking boots are over a pound
Our initial prototypes were around 0.8 pounds
The heavy winter boot is over 2 pounds
Our next prototypes are expected to weigh even less than the initial prototypes but be even warmer.
• The comfort and weight of a running shoe. It weighs just 14.5 oz.
• Waterproof and breathable materials
• 600 gr high tech insulation around the foot
• Insulated insole rated to -20 deg F
• Compactable: Fits easily into a travel bag – even a briefcase
• Designed to let the foot move with a flexible sole and a wide toe box – a free moving foot is a warm foot
Designing a Better Winter Boot:
How warm is your shoe or boot
A typical running shoe will lose 1 deg of heat in 2 minutes
A Solomon classic ski boot takes 2.6 minutes to lose 1 deg
Our initial prototypes are about the same as a good winter hiking boot, about 2.8 minutes to lose 1 deg
A very heavy winter boot takes about 3.5 minutes to lose 1 deg
Our next prototype will have thicker insulation and this chart will be updated in December to reflect the latest design
Much more information is available on our website:
Here is a link to a Youtube video of our project