Are they comfortable to walk around on or can you feel the wires inside?

A lot depends on your boots, your socks and your terrain. I can definitely feel the wires through my thin Smartwool socks, but it's only intermittently bothersome. No matter how I wrap the extra cord or tuck them into my boot tongues, I have to reach down and pull the wires up multiple times a day or re-tuck the Velcro. Part of this is due to jarring from skiing black to double-black terrain (bumps, trees, drops, etc.) I wouldn't notice wires if I were skiing gentle groomers and wearing thicker socks. Repeated up-and-down motion jars everything loose, especially plugs from their sockets, turning off the heat. This is my biggest gripe.

How long are they running on full power ?

I need a pretty cold day (sub-10° F) and poorly insulated boots to run full power longer than 20-30 minutes. I usually run at 50-75%, but I sometimes need full power at elevations above 11,000 feet or in the morning when ski boots are cold. Full power drives out end-of-day clamminess but it causes excessive perspiration earlier, which leads to clamminess when the temperature drops. Re-reading your question, maybe you wanted to know how long the batteries will last at full power? Answer: unknown – they are too hot to test at 100% power in 0° F and above with normal boots. Maybe somebody else has extended sub-zero experience with them. PS, I have chronically cold feet.

The toe shape does not match my boot. Can you cut the front/toe section without cutting the circuit?

yes, you can cut the front section more. Even if the heating element is cut, the insole can still work normally.

How do you order a size?

You cut them to fit your feet or bottom of the shoe.

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Thermrup Electric Heated Insoles Foot Warmers Rechargeable Li-Ion Battery(4 Temperature Settings) Size 4.5-14, Far Infrared, High Temperature

Thermrup Electric Heated Insoles Foot Warmers Rechargeable Li-Ion Battery(4 Temperature Settings) Size 4.5-14, Far Infrared, High Temperature

Product ID: 92962447

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Details

Size
9 Piece Set
Brand
Thermrup
Color
black
Material
Polyester
Battery Description
Lithium-Ion

🔋2500mAh rechargeable Li-Ion battery

🔥4 heat settings for personalized warmth

🦶18cm heating surface from heel to toe

Description

🔥 Step into warmth, stay ahead of the cold!

FULL FOOT COVERAGE - Extended 18cm heating element delivers deep, even heat from heel to toe for ultimate comfort.
LONG LASTING POWER - Robust 2500mAh Li-Ion battery ensures hours of uninterrupted warmth on the go.
VERSATILE WASHABLE - Machine and hand washable insoles fit sizes 4.5 to 14, perfect for outdoor sports, work, and everyday cold defense.
CUSTOMIZABLE HEAT CONTROL - Four precise temperature levels to keep your feet perfectly cozy in any cold scenario.
DURABLE GERMAN ENGINEERING - Premium rubber heating elements designed for reliability and longevity, trusted by 100,000+ users since 2015.

Thermrup Electric Heated Insoles combine advanced German engineering with a rechargeable 2500mAh Li-Ion battery and four adjustable heat settings, delivering consistent, full-foot warmth via a durable 18cm rubber heating element. Designed for active professionals and outdoor enthusiasts, these washable insoles fit US sizes 4.5 to 14 and have been trusted by over 100,000 customers since 2015.

Specifications

Size	9 Piece Set
Brand	Thermrup
Color	black
Material	Polyester
Battery Description	Lithium-Ion
Battery Capacity	2500 Milliamp Hours
Included Components	1
Reusability	Rechargeable
Use for	Feet
Power Source	Battery Powered,Electric
Manufacturer	Zewox GmbH
Item Package Dimensions L x W x H	12.91 x 4.84 x 2.05 inches
Package Weight	0.6 Kilograms
Brand Name	Thermrup
Warranty Description	2 Years
Model Name	HI616AKK
Suggested Users	unisex-adult
Part Number	HI616AK

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