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When you shop with us, we want you to be completely satisfied.
If for any reason you are not satisfied with your purchase, return it within 60 days for an exchange or a refund for the purchase price.
Learn more about our Return Policy
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The UnderWarmer is a convenient, one-time use compression shirt with a secret deigned to keep you warm for 10-12 hours straight! 8 strategically air-activated heating packs are woven into the front and back of the compression shirt.
Simply take the UnderWarmer out of its packaging, and it begins to heat up, reaching temperatures up to 100 degrees Fahrenheit. No batteries required!
The shirts are tailored to have a compression fit, pressing the heat packs up against your body. Warming your core like this provides total body warmth, including your extremities. It's lightweight and won't weigh you down like bulky base layers or coats. You can wear it right up against your skin or over a regular shirt.
Stay warm for an entire day outside. Whether you're ice fishing, shoveling, sledding, hiking, hunting, or tailgating, keep warm in even negative digits.
Sizes:
Medium: Chest 35 - 39 Inches
Large: Chest 40 - 44 Inches
X-Large: Chest 45 - 49 Inches
Note: These compression shirts are designed to feel a little snug, making the heat packs more effective.
FEATURES and BENEFITS:
- 8 Air-Activated Heat Packs Reach up to 100 Degrees
- No Batteries Required
- Compression Fit
- Warms Entire Core, Front and Back
- Lasts 10-12 Hours Straight
- Lightweight for Active Use
- All-Day Warmth while Fishing, Hunting, Tailgating, and More
- Single Use Shirt
- Use as Base layer or Over an Undershirt
- Patent-Pending
- Shirt Material: 67% Hydrophobic Non-Woven Fabric, 33% Spandex
- Heat Elements: Iron Powder, Water, Salt, Activated Charcoal, Vermiculite
- Choose your size: Medium, Large, X-Large
Simply take the UnderWarmer out of its packaging, and it begins to heat up, reaching temperatures up to 100 degrees Fahrenheit. No batteries required!
The shirts are tailored to have a compression fit, pressing the heat packs up against your body. Warming your core like this provides total body warmth, including your extremities. It's lightweight and won't weigh you down like bulky base layers or coats. You can wear it right up against your skin or over a regular shirt.
Stay warm for an entire day outside. Whether you're ice fishing, shoveling, sledding, hiking, hunting, or tailgating, keep warm in even negative digits.
Sizes:
Medium: Chest 35 - 39 Inches
Large: Chest 40 - 44 Inches
X-Large: Chest 45 - 49 Inches
Note: These compression shirts are designed to feel a little snug, making the heat packs more effective.
FEATURES and BENEFITS:
- 8 Air-Activated Heat Packs Reach up to 100 Degrees
- No Batteries Required
- Compression Fit
- Warms Entire Core, Front and Back
- Lasts 10-12 Hours Straight
- Lightweight for Active Use
- All-Day Warmth while Fishing, Hunting, Tailgating, and More
- Single Use Shirt
- Use as Base layer or Over an Undershirt
- Patent-Pending
- Shirt Material: 67% Hydrophobic Non-Woven Fabric, 33% Spandex
- Heat Elements: Iron Powder, Water, Salt, Activated Charcoal, Vermiculite
- Choose your size: Medium, Large, X-Large
We've found the secret to warmer tailgating - your neighbors won't have a clue just how toasty you feel in even the coldest weather. For just about any cold fall or winter activity, you'll want to pack along the UnderWarmer heated compression shirt!
A well-heated core also warms the extremities, and unlike heated gloves - there's no batteries or wires to worry about. Just take it out of the package, and the air activates the heat packs up to 100 degrees.
You've got total coverage with 4 heat packs front and back in the optimum spots in chest, torso and back.
It's lightweight and was developed for the most strenuous outdoor activities: hunting, hiking, or even shoveling the driveway. It works great for all those other winter activities too - like ice fishing, sledding, and ESPECIALLY tailgating. Here in the midwest, those football games get mighty cold!
Remember, this is 10-12 hours of warmth that you can enjoy practically all day long. After you're done with it, just toss it in the garbage. They are designed to be single use.
But these are great to have on hand for emergencies, or well-planned outdoor activities!
FEATURES and BENEFITS:
- 8 Air-Activated Heat Packs Reach up to 100 Degrees
- No Batteries Required
- Compression Fit
- Warms Entire Core, Front and Back
- Lasts 10-12 Hours Straight
- Lightweight for Active Use
- All-Day Warmth while Fishing, Hunting, Tailgating, and More
- Single Use Shirt
- Choose your size: Medium, Large, X-Large
- Detailed Sizing Info Available on our Site
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