8 Hours of Warmth on LOW. No Boot-Collar Wires. No Hidden Subscription.
Three heat levels (104 / 122 / 140 F). 3000 mAh cells integrated in each insole - never clipped to your boot collar. App control or physical button. Trim-to-fit for US 4-12.5. 60-day at-home trial.
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How It Works
How It Works
- Trim along the printed size guides with household scissors - 2 minutes per pair, then slide them into your boots.
- Hold the heel button to power on. Press to cycle LOW (104 F) / MED (122 F) / HIGH (140 F). Or open the iOS / Android app for independent left-right control.
- Walk out. The 3000 mAh cell holds 8+ hr on LOW, 4-5 hr on MEDIUM, 119 min on HIGH. Recharge overnight via the 5V 2A USB cable.
What's Included
What's Included
- Pair of ThermoStride Heated Insoles (3000 mAh)
- 5V 2A USB charging cable
- Storage / charging case
- Quick-start guide + size chart
Shipping & Returns
Shipping & Returns
We offer free shipping for all orders. Order processing
takes 1-3 business days before shipment. Once your item/s is dispatched,
the estimated delivery time is:
- USA: 2-12 business days
- UK: 5-13 business days
- Australia: 5-13 business days
- Canada: 2-12 business days
- Europe: 5-13 business days
ThermoStride
Built for the Boot, the Stand, the Lift Line, and the Route
8+ Hours of Heat on LOW
3000 mAh integrated cell. 119 min verified at 140 F (HIGH). 4-5 hr at 122 F (MEDIUM). 8+ hr at 104 F (LOW) - the setting most buyers actually use for a full shift, sit, or ski day. No mAh inflation hiding a 30 min reality.
Three Heat Levels + Independent Left/Right
104 / 122 / 140 F via the heel button. Or open the free app for a temperature readout, independent left-right control, and 6 timer presets (15 / 30 / 45 / 60 / 90 / 120 min). Set once, then your phone goes back in your pocket.
0.19 Inch Profile - Fits Boots You Already Own
4.8 mm thick. Slides into ski boots, hunting pacs, and work boots without changing the factory fit. Trim along the printed guides for US 4-8 (S) or US 8-12.5 (L) in 2 minutes.
Sealed Cell Construction - No Hollow Housing
The 3000 mAh battery is sealed inside with injection-molded reinforcement. No hollow plastic shell to crack on a hard kneel or rough landing. Splash and slush rated. Anti-microbial top layer holds up through a 12 hr shift.
What our 17,000+ Customers say
Based On Real and Honest Experiences
Used to climb down from the lift at noon. Now I ride first chair to last chair on MEDIUM, then drop to LOW between runs. The integrated battery means no wires under my powder strap - the upgrade was worth it for that alone.
5 a.m. dog walk in Minnesota. Left foot on MEDIUM, right on HIGH because of an old break that never healed warm. Two winters in. Still pairs instantly. The physical button is what I actually use - one tap before the door.
Eight hour ice fishing sit at 8 F. Set both insoles to LOW before climbing onto the bucket and never touched the app again. Battery showed 22 percent left when I packed up. Phone stayed in my pocket - no glow, no pings.
Frequently Asked Questions
How long do they run on LOW versus HIGH?
How long do they run on LOW versus HIGH?
HIGH (140 F): 119 min verified by independent testing. MEDIUM (122 F): 4-5 hr. LOW (104 F): 8+ hr - enough for a 12-mile postal route, a 9-hour treestand sit, or a full ski day. The 3000 mAh cell delivers the LOW number buyers actually need.
Can I set the left foot warmer than the right?
Can I set the left foot warmer than the right?
Yes. Each insole has its own cell and thermostat. The iOS / Android app lets you dial each foot with a temperature readout in F or C. Set once, drop the phone in your pocket, and the insoles run silent.
Will they survive snow, slush, and a wet boot at lunch?
Will they survive snow, slush, and a wet boot at lunch?
Yes. Sealed against splashes, light rain, and slush - the conditions a postal carrier, ski day, or treestand sit puts them through. Avoid full submersion. Wipe down with a damp cloth between charges.
How do I trim them to fit my boot size?
How do I trim them to fit my boot size?
Pull your factory insole, lay it on top, trim along the closest printed line with household scissors. 2 min per pair. S covers US 4-8 (EU 35-40); L covers US 8-12.5 (EU 40-46). The heating element sits at the toe and ball - rear cuts do not harm the cell.
Are they safe for Raynaud's, neuropathy, or diabetic feet?
Are they safe for Raynaud's, neuropathy, or diabetic feet?
Many users with Raynaud's and mild diabetic neuropathy run ThermoStride on LOW (104 F / 40 C) daily. Independent left-right lets you set each foot precisely. Consult your doctor if sensation is impaired.
Do I need the app, or can I press a button?
Do I need the app, or can I press a button?
A physical button on the heel cycles LOW / MED / HIGH. No phone required. No subscription. The app is optional - it adds independent left-right and 6 timer presets. Most daily-use buyers never open it.
Will they fit inside ski boots, hunting pacs, or work boots?
Will they fit inside ski boots, hunting pacs, or work boots?
Engineered at 0.19 inch / 4.8 mm to slide into Lange / Salomon ski boots, LaCrosse / Muck pacs, and Red Wing work boots without changing the factory fit. Trim the printed guides. Custom orthotic? Layer on top.
What if they don't fit or the heat isn't right for me?
What if they don't fit or the heat isn't right for me?
60-day at-home trial. If they do not fit or do not reduce cold-feet pain, email hello@primydeals.com for a full refund - keep them or return at our expense. Heating elements covered for 1 year.