Underform Sweatproof Undershirt — front view
Underform Sweatproof Undershirt — product detail
Underform Sweatproof Undershirt — product detail, alternate angle
Underform Sweatproof Undershirt — worn under an outer shirt
Sweat Blocking Undershirt
Underform Sweatproof Undershirt — fabric and fit detail
Underform Sweatproof Undershirt — Crew Neck and Deep V-Neck compared
Underform Sweatproof Undershirt — White and Black colour options
Underform Sweatproof Undershirt — protected underarm construction

Underform Sweat-Protective Undershirt

Keep underarm sweat off the shirt people see.

Regular price£35.00
/
Tax included.
Soft, breathable modal construction, with three-layer protection engineered into the underarm.

Color
Size
Neck Style
  • Blocks sweat at the protected underarm area
  • Soft, breathable modal, no elastane
  • Discreet under Crew or Deep V
Bundle and save Free UK delivery
2 pack
£28.00 £35.00 per shirt, 20% off
4 pack
£26.25 £35.00 per shirt, 25% off
6 pack 4 + 2 free
£23.45 £35.00 per shirt, 33% off
Select a bundle

Please choose a size and colour for every shirt.

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Enjoy free shipping on all orders. We ship your order within 24 hours, so you can receive your Underform essentials as quickly as possible. Plus, every order is covered by our 30-day return guarantee for complete peace of mind.

Use collapsible tabs for more detailed information that will help customers make a purchasing decision.

Ex: Shipping and return policies, size guides, and other common questions.

EXAMPLE
material guidelines: Materials
• Made of 47.5% Lyocell (a plant-based fabric made of wood pulp from eucalyptus trees), 47.5% Cotton and 5% Elastane
• OEKO-TEX, SA8000, and BSCI social compliance certified
• Woven and sewn in China

Proof not promises

Don't take our word for it. Watch what happens when moisture reaches the protected underarm area and what does not reach the outer shirt.

🎥 Filmed in a single, unedited take.

The science behind Underform

Protection is concentrated where sweat starts, while the rest of the shirt stays lightweight and breathable.

Close up of the protected underarm construction

Three layers where sweat starts

A three layer construction sits in the underarm area, creating protection between your skin and your outer shirt.

Show moisture being managed inside the protected area

Moisture stays in the protected area

The protected construction manages moisture where it starts and helps stop it transferring through to your outer shirt.

Close up of the lightweight modal main body

Breathable everywhere else

The main body is made from lightweight 100% modal, keeping the rest of the shirt soft and breathable.

01 / 03

Wear your shirt.
Forget about the sweat

Underform helps keep underarm sweat away from your outer shirt, so you can spend less time thinking about what might be showing.

01 Keep your shirt looking dry

Underform helps stop underarm sweat reaching your outer shirt, keeping what others see looking unaffected.

02 Stop checking

Less looking in mirrors, checking your shirt or wondering whether a sweat patch has appeared.

03 Wear the colours you want

Reach for light blue, grey and other shirts you may normally avoid because sweat shows too easily.

04 Move naturally

Raise your arms, present and go about your day without calculating what might show.

Underform, in their words.

4.6 / 5 147 Reviews

Wear it. Wash it. Decide for yourself.

Give Underform a proper try. Wear it through real days and wash it several times. If you are not satisfied within 30 days, you get your money back.

Wear it
Put it through real working days and see how it performs for you.
Wash it
Wash it several times and make it part of your normal routine.
Still not convinced?
Tell us within 30 days and get your money back.
PLACEHOLDER_EBWCDC

Questions people ask before buying

Straight answers, without overselling what it does.

Does it actually stop sweat marks?

Underform is designed to stop sweat transferring through to your outer shirt at the protected underarm area. It doesn't cover the whole shirt or your whole body. It's built specifically for the underarm, where sweat marks are most visible.

I already use antiperspirant. Do I still need this?

Antiperspirant reduces how much you sweat at the skin. Underform doesn't replace that. It's a separate barrier for the sweat that does still reach your outer shirt. Most people use both together, not one instead of the other.

Will an extra layer make me hotter?

The protected underarm area is thicker than a normal T shirt, and you may notice it, especially at first or on a warm day. The rest of the shirt is soft, breathable modal, so the extra weight stays where it's needed rather than across the whole shirt.

What's it made of?

The main body is 100% modal, with no elastane. The protected underarm area uses a separate three layer construction, described earlier on this page.

Which neckline should I choose, Crew or Deep V?

Crew is best if you keep your shirt buttoned up to the collar. Deep V is best if you like to wear one or more buttons open, since it stays hidden with a lower neckline.

How many should I buy?

For everyday wear, most people find two is the minimum to keep one in rotation while the other is being washed. Three covers a working week without relying on same day laundry.

What if it doesn't work for me?

[Answer depends on the final guarantee mechanics. Window length, proof of wear requirement, and refund or exchange terms are not confirmed yet. Do not publish specifics here until Section 13 is finalised.]

How do I wash it?

[Care instructions are not finalised yet. You mentioned moving this into a dropdown on the hero section, so this answer can either link there once built, or repeat the same confirmed instructions once they exist.]