Unisex Base Layer Shirt
Black / XS
Sale price
$44.00
Regular price
$88.00
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reviews
Shirt
Unisex Base Layer Shirt
Sale price
$44.00
Regular price
$88.00
Save 50%
A thin, light base layer knitted with FIBREHEAT® technology. Wear it under anything on cold days — it holds your own warmth close.
Why FibreHeat is different
- Warms without batteries
- Thin and light under any layer
- Works all day — nothing to recharge
- Machine washable
Description
Our men’s and women’s base layer shirt is an upgrade from all others because it will keep you warm and comfortable under any conditions. It’s thin, it’s light, but it will provide the warmth you want whether you’re working out or just engaging in everyday activities. Our t-shirt is the latest in cold weather gear, featuring our patented technology that provides unmatched heat generation and heat retention. So, start with this base layer shirt, wear whatever you want over it, and be confident you’ll be warm and dry all day long.
Care Instructions:
Machine Wash Cold, Delicate Cycle. Do Not Bleach. Tumble Dry Low, Remove Promptly
Contents:
63% Polyester/25% Viscose/12% Acrylic
Sizing:
Unisex, please use the Size Chart to choose your correct size
How it works
FIBREHEAT® fibers are knitted right into the fabric. They hold on to the heat your body gives off and return it to your skin, so there are no batteries, wires or charging. Warmth starts as soon as you pull them on.
Materials & care
Care
Machine Wash Cold, Delicate Cycle. Do Not Bleach. Tumble Dry Low, Remove Promptly
Materials
63% Polyester/25% Viscose/12% Acrylic
Shipping & returns
Free shipping on US orders over $99. Canadian orders ship for a flat $18.
US orders can be returned within 30 days of delivery, unworn, with tags attached and in the original packaging. A return label is included; return postage is paid by the customer. Sale items can't be refunded, but we offer free size exchanges. Read the full return policy.
How FibreHeat works
The heat is in the fabric. Not in a battery.
No wires, no charging, no power pack. FibreHeat works with the warmth you already make, so it's there whenever you pull your liners on.
01
The fibers generate heat.
FibreHeat fibers are knitted right into the fabric. As soon as you put them on, they turn your body’s natural moisture into warmth.
02
They store it.
That warmth is held in microscopic heat-packs inside the fibers, instead of escaping into the cold.
03
And return it to you.
Stored heat is released back to your skin as far infrared warmth, evenly and continuously, for as long as you're wearing them.
The simple comparison
FibreHeat vs. battery‑heated gloves.
Both keep your hands warm. One asks a lot less of you.
A general comparison with typical battery-heated gloves. Individual products vary.
| FibreHeat | Battery-heated | |
|---|---|---|
| Weight | Feels like an everyday knit glove | Extra weight from packs and wiring |
| Charging | Never. There's nothing to plug in | Needs charging before you head out |
| Bulk | Slim enough to layer or wear alone | Bulkier cuffs to house the battery |
| Washing | Nothing to remove before cleaning | Battery out first, often hand-wash only |
| Wear time | Warm for as long as you wear them | Warmth ends when the battery runs down |
Field notes
Field notes from the people who wear them.
Reviews from verified FibreHeat buyers, collected and shown by Stamped.
–.–
No reviews yet. Be the first to tell us how they keep you warm.
Does it need batteries or charging?
No. There are no batteries, wires or chargers in any FibreHeat® product. The warmth comes from FIBREHEAT® fibers knitted into the fabric, which hand your own body heat back to you.
How warm will it feel?
A gentle warmth that builds soon after you put it on. It isn't the hot-plate feel of a battery-heated product. It's steadier and quieter, and it lasts as long as you're wearing it.
Can I machine wash it?
Yes. Machine wash cold on a delicate cycle and don't bleach. Tumble dry low and take it out promptly.
How big is the throw?
About 50 × 70 inches. It’s a fine-gauge knit, thin but substantial, for cold winter nights, cool summer evenings or a chilly air-conditioned room.
How do I choose my base layer size?
It's a unisex fit: use the size chart to choose yours. It's thin and light, made to wear under whatever you put on over it.
Can I return or exchange it?
We offer free size exchanges on eligible items, subject to availability; you cover the return postage. Unworn items from US orders can be returned within 30 days of delivery. See our refund policy for details.
Our promise
Wear them on your coldest day. Then decide.
We would rather you judge FibreHeat on a cold platform than on a product page. Order, wear them, and if they aren't right for you, send them back within 30 days.
I.
Free shipping over $99
On US orders.
II.
30-day returns
If they aren't right, send them back.
III.
Real support
Real people answer, fast.
— The FibreHeat team
Questions before you order? Talk to our support team.
Pairs well with
You might also like to finish the layer.
Hats, neck warmers and socks with the same self-heating fibers.