Instant warmth for frosty starts.
16 heat zones across chest, back & arms fire up in 30 seconds.
Heated Base Layer Top
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30-Day Returns
Unmatched Warmth, Built For Everyday
The Heated Base Layer Top delivers rapid, targeted warmth with ThermoSphere™ heating technology, engineered to keep your upper body comfortable when temperatures drop.
16 ThermoSphere™ panels warm your chest, back, and arms in just 30 seconds, so you stay cosy whether you’re commuting, training outdoors, or spending long days in the cold.
✓ 16 targeted heat zones
✓ Up to 10 hours runtime
✓ Adjustable 3-level warmth
What’s Included?
1x Heated Base Layer Top with 16 integrated ThermoSphere™ panels
1x USB cable for connecting a power bank
NOTE: Power bank sold separately. Works with any standard 5V USB power bank, including our long-lasting 10,000mAh power bank (up to 10 hours of heat). Add one to your order if you don’t already have a compatible power bank.
Key Specs
16 Heat Zones: Core, elbows, back
3 Heat Levels:
Low: 25°C / 77°F for 10hrs
Medium: 35°C / 95°F for 8hrs
High: 45°C / 113°F for 6hrs
Power: 5V USB
Runtime: Up to 10 hours (using our 10,000mAh power bank)
Fit: Regular
Materials: Polyester
Care Instructions
Remove power bank before washing
Machine wash cold, gentle cycle
Line dry; do not tumble dry
Compatibility
Works with any 5V USB power bank
Optimised to work with our 10,000mAh power bank
Shipping
Free shipping on every order
Fast dispatch within 24 hours
Tracked delivery straight to your door
Delivery Times:
USA: 6-10 days
UK: 4-8 days
Rest of World: 6-10 days
NOTE: Power banks ship separately due to international battery regulations. They will arrive after your heated clothing, typically 12-15 business days from dispatch.
Read our full shipping policy.
Returns
30‑day returns from delivery
Item must be clean, unworn and undamaged
Start a return via our return portal.
Read our full return/refund policy.
We’re confident you’ll love your new Heated Base Layer Top, but if not, return it within 30 days for a full refund, no questions asked.
Most customers never need it: Fewer than 1% of customers take us up on this guarantee.
What’s Covered
Fit or comfort was not as expected
Performance concerns
Manufacturing defects
How To Claim
1) Start your request via our Returns Portal
2) Receive your return label and instructions
3) Refund issued once the item is received and inspected
NOTE: Normal wear and tear isn’t considered a defect
Heated Base Layer Top
Sale price$119.99
Regular price$149.99
Free US
Shipping
30-Day
Returns
Money Back
Guarantee
What Makes toastybody Different?
Heat Up In 30 Seconds
16 ThermoSphere™ panels warm your chest, back & arms fast.
3 Adjustable Heat Levels
One tap to switch between low, medium & high.
Up To 10 Hours Runtime
Pair with our 10,000 mAh power bank for all-day heat.
Washable & Adventure-Proof
Layer under any coat, machine-washable for daily use.
ThermoSphere™ Technology: Smarter Heat You Can Feel Instantly
ThermoSphere™ is the engine behind every ToastyBody top. 16 ultra-thin, flexible carbon panels deliver fast, even warmth, without adding bulk. Built right into the fabric, it feels like part of you, not something you're wearing.
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Power That Lasts
Works with any 5V USB power bank but pair it with our power bank for up to 10 hours of heat.
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Heat You Control
Three simple settings let you switch from a gentle boost indoors to serious warmth outdoors.
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Full Freedom Of Movement
Slim, stretch panels target your core, back and arms without stiff wires or bulk.
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Safety Built-In
Auto-regulation keeps heat consistent. No spikes, no worries.
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Smarter Efficiency
ThermoSphere™ gives you maximum heat with minimum drain, so you stay warm longer.
Note: Third-party power banks vary in quality. Low-quality units may reduce runtime or performance. For best results and safety, use the official ToastyBody Power Bank (sold separately).
Why toastybody
Sets The Standard
Heated base layers made to move, built to last, and trusted by 11,000+ customers.
Conquer Every Cold Moment
Under‑jacket heat, zero bulk.
Slim base layer slips under coats without the Michelin‑man look.
Warm you, not the room.
Cut your energy costs, stay cosy at home with a single power bank
Cheer longer, shiver less.
Even warmth over your core keeps the chill off for hours.
Work‑ready heat that moves.
Stretch fabric + targeted panels = mobility and steady warmth.
Ride farther in comfort.
Heat sits close to your core; layers cleanly under jackets.
Trail heat after sunset.
Quick‑heat top keeps your torso warm when temps drop.
First lift to après.
Base‑layer warmth beneath midlayers. No bulk, just heat
Warmth You Can Trust
Trusted by 11,000+ customers who rely on their base layer to deliver all-day heat.
Every Heated Base Layer Top is backed by our quality guarantee so you can shop with total confidence.
- Free Shipping Fast & Tracked
- 30‑Day Returns Try It Risk-Free
- Quality Guarantee Built To Last
- Helpful Support Real People, Real Help
Find Your Perfect Fit
Regular, layer‑friendly fit for efficient heating. Between sizes? Size up for thicker mid‑layers; stay true for a closer fit.
Easy 30‑day returns if it’s not quite right.
Gender: Men
Units: cm
Heated Base Layer Top — Men
| Size | Chest (cm) | Length (cm) | Sleeve (cm) |
|---|
Fit & Measuring Tips
Fit intent: Designed to sit close to the body for efficient heating without feeling tight.
Layering: If you’ll wear it over a hoodie or chunky knit, size up.
Chest: Measure under arms around the fullest part, tape level.
Length & Sleeve: Measured on garment; allow small variances between batches.
Need help with sizing? Email our team
Got Questions?
We’ve got answers.
Will it fit comfortably under my usual layers?
Yes. Slim, stretch fabric designed to layer.
Will it fit comfortably under my usual layers?
Yes. Slim, stretch fabric designed to layer.
The Heated Base Layer Top is close‑cut and flexible, so it slides under sweaters, fleeces, and jackets without bulk. If you prefer extra room or plan to wear thicker mid‑layers, consider sizing up.
Does the top need a power bank?
Yes, one required (sold separately).
Does the top need a power bank?
Yes, one required (sold separately).
The top connects via its own USB lead and requires a power bank to run. When you add the top to cart, you’ll see a friendly prompt to add a compatible power bank, so you won’t miss it. While most 5V USB banks will work, we recommend the ToastyBody 10,000 mAh Power Bank for safe, reliable performance and all‑day runtime.
Where does the power bank go, will it get in the way?
Tucked into a discreet, low‑profile pocket.
Where does the power bank go, will it get in the way?
Tucked into a discreet, low‑profile pocket.
There’s an internal pocket near the hem designed to hold the power bank securely. A short, routed cable keeps everything neat and out of your way while you move.
How warm does it get, and how fast?
Feel heat in 30 seconds with 3 settings.
How warm does it get, and how fast?
Feel heat in 30 seconds with 3 settings.
The ThermoSphere™ system warms up within 30 seconds. Switch levels at the press of a button:
- Low (white light): ~25 °C / 77°F up to 10 hrs
- Medium (blue light): ~35 °C / 95°F ~7–8 hrs
- High (red light): ~45 °C / 113°F ~5–6 hrs
Is it good for high‑intensity training or runs?
Best for low‑to‑moderate activity.
Is it good for high‑intensity training or runs?
Best for low‑to‑moderate activity.
The top shines for commuting, outdoor work, walking, spectating, or everyday winter use. During high‑intensity workouts, most people warm up quickly. Heated layers may feel too warm or unnecessary.
How many heating zones are there, and where?
16 ThermoSphere™ zones target your back, core and elbows.
How many heating zones are there, and where?
16 ThermoSphere™ zones target your back, core and elbows.
The top features 16 heating elements, mapped across the core, upper/lower back, and along the arms for balanced, gentle warmth where you feel the cold most.
What sizes are available, and how should I choose?
True‑to‑size; size up if layering thick mid‑layers.
What sizes are available, and how should I choose?
True‑to‑size; size up if layering thick mid‑layers.
We recommend your usual base‑layer size for a close, heat‑efficient fit. If you’re between sizes or want room for thicker layers, go up one size. Check our size chart for chest and waist guidelines.
How do I wash and care for the top?
Machine washable, remove the power bank first.
How do I wash and care for the top?
Machine washable, remove the power bank first.
Unplug and remove the power bank, zip up, and place the top in a laundry bag. Wash on a gentle cycle and air‑dry only. Avoid bleach, ironing, or dry cleaning to protect the heating elements.
Still got a question? Email our team — we’re here to help.
Trusted by 11,000+ customers
Experience All-Day Warmth
- 16 ThermoSphere™ Zones
- Heats Up In 30 Seconds
- Up To 10 Hours Runtime
Want head‑to‑toe heat? Get The Set
Free Shipping · 30‑Day Returns