Frequently Asked Questions

The Thompson Tee Hydro-Shield® sweat proof barrier combines innovative design and advanced materials. Our shirts feature a patented proprietary layering system of clinical-grade fabric that creates air pockets and facilitates reverse osmosis, blocking moisture from passing through. This barrier acts as a shield, preventing underarm sweat from reaching your shirt’s outer layer.

Our sweat proof undershirts are not designed to control odor. However, if you’re looking for a comfortable and effective way to combat underarm odor, look no further than Thompson Tee’s Anti Odor T-shirts. Featuring our advanced Odor Shield™ technology, these shirts trap and neutralize skin bacteria, eliminating 99.9% of odor for all-day freshness and confidence.

Note: Our Anti Odor garments do not contain our sweat proof underarm barriers.

While conventional underarm sweat pads and sweat shields may absorb some sweat, they do not allow moisture to evaporate. So, throughout the day, armpit pads can lose their stickiness or become heavy and bulky beneath your shirt. Unlike sweat shields, garment guards and sweat pads, Thompson Tee’s underarm barrier is the only patented sweat proof technology available.

By trapping sweat and releasing it through evaporation, your sweat won’t show through your outerwear. Plus, you won’t have to worry about adjusting your sweat pad throughout the day.

Thompson Tee made the original sweat proof undershirt. Our Hydro-Shield® sweat proof technology completely absorbs and evaporates sweat while maintaining breathability. Ours is the only sweat proof undershirt backed by a patent from the U.S. Patent and Trademark Office.

Although others might say "sweat proof," no undershirt can protect you like the proven Thompson Tee, and no other shirt has patented technology to back up such a claim.

Thompson Tee’s integrated underarm sweat barrier is guaranteed to block 100% of underarm sweat—or your money back! If you’re dealing with a condition like axillary hyperhidrosis, our shirts will help you manage your sweat level and stay comfortable and confident all day long.

No, not at all. Once the sweat proof barriers soak up your sweat, our proprietary layering system creates air pockets that facilitate reverse osmosis, releasing your sweat as vapor and leaving you feeling dry and comfortable. In other words, we help you cool off more efficiently.

Yes! While most moisture-wicking materials are treated with harsh chemicals that wear off after a couple of washes, we make Thompson Tees with natural fabrics like rayon from bamboo and premium combed cotton. This makes our garments last longer than many other undershirts, including retaining their sweat and odor-fighting abilities well beyond a handful of washes.

Thompson Tee garments are all highly durable and withstand regular use and washing. The shirts are crafted from high-quality materials and construction techniques to ensure longevity.

By following proper care instructions, you can maintain the durability and sweat protection properties of Thompson Tees over an extended period. While the exact lifespan will vary depending on individual usage, customers generally find our sweat proof undershirts long-lasting and reliable.

No—there’s no liquid build-up and nothing to squish out in our sweat proof lines. The barrier releases moisture as vapor, keeping you dry and comfortable without embarrassing wet marks.

Thompson Tee uses the following sizing for men’s and women’s clothing:

Here’s how to measure for the best fit across our products:

• For chest measurements, measure around the fullest part of your chest, keeping the tape measure under your armpits and around (not above/below) your shoulder blades.
• Consult the sizing guides for other manufacturers’ undershirts and shirts you wear. If you’re between sizes, pick the next largest size for the most comfortable fit.

See our Thompson Tee Buyer’s Guide for more sizing information.

If you’re unsure about sizing, go one size larger to allow for shrinkage. Our sizing accounts for anticipated shrinkage, so shirts will fit the approximate measurements after being washed. How much any garment actually shrinks will vary depending on machines, settings and other factors.

The shirt and size you choose will ultimately depend on your fit and style preferences.

• Original Fit shirts provide more breathing room for those who prefer a looser undershirt. If you’re looking for sweat protection in a T-shirt fit.
• Slim Fit shirts are designed to fit snugly, so they’re more discreet underneath your other garments. They’re also ideal for those looking for a more form-fitting tee.

Other factors to consider, besides base silhouette, include neck style and sleeve length. Check out our Buyer’s Guide to learn more about choosing the right Thompson Tee product for you.

Yes! Our undershirts are designed to be worn under other shirts. Both Original Fit and Slim Fit undershirts are designed with extra length to ensure they stay tucked in without bunching.

Any Thompson Tee undershirt, including long-sleeve options, will work under a conventional collared dress shirt. If you’re looking for a sleek look or want to wear an undershirt beneath a t-shirt or other garment, consider a Slim Fit, short-sleeved undershirt. If you’re looking for an option that can double as an outer t-shirt, consider our Lux Tee with Anti Odor technology.

Our sweat proof undershirts actively draw away moisture to keep you dry and comfortable all day. Their slim, discreet design makes them virtually invisible beneath dress shirts, no matter the color, and the premium materials offer durability that far outlasts a standard undershirt.

Thompson Tees are designed with minimal seams to reduce visibility and enhance comfort. However, depending on the fit and thickness of the white dress shirt worn over the Thompson Tee, there is a possibility that faint seam lines may be slightly visible. The visibility of the seams can also depend on the lighting conditions and the specific fabric of the dress shirt you choose.

To minimize seam visibility, we recommended choosing a dress shirt that is not overly tight and pairing it with a Thompson Tee undershirt that closely matches the color of the dress shirt.

Yes! Thompson Tee undershirts can be machine-washed in cold or warm water and dried in medium (or lower) heat in most consumer and commercial washing machines and dryers.

We HIGHLY recommend turning the garment inside out when washing AND drying to ensure the fabric exposed to the skin and sweat is thoroughly cleaned and dried. You can also hang our undershirt to dry in the sun. Please see your neck label for complete care instructions.

We also recommend avoiding bleach, bleach alternatives and bleach byproducts, along with dry cleaning and ironing, as these products and practices could potentially compromise our sweat proof technology.

We recommend washing all garments before wearing them for the first time, especially undergarments. This will tighten the fibers, making them softer and more comfortable.

We do not recommend sleeping overnight in the Thompson Tee. Thompson Tees are functional garments, and there is no inherent problem with wearing them overnight, but we do not advise doing so because underarm sweat is generally not a concern during sleep. Minimizing regular wear and tear will optimize functionality when it matters and prolong the lifespan of the shirt.

We build anticipated shrinkage into each garment we create, so your shirt should shrink to the designated size on our chart. You can expect minimal shrinkage compared to other undershirts.

For example, our Original Fit sweat proof shirts are made of cotton, so you can expect about 5% shrinkage. Our Slim Fit sweat proof shirts use rayon and spandex, so you can expect about 8% shrinkage. Other products that feature high-quality cotton and poly blends have similar shrinkage.

Everyone sweats, and sweat smells. To prevent odor from sticking around, turn the shirt inside out when washing to ensure the part exposed to your skin is thoroughly cleaned and dried.

We recommend pretreating by applying non-bleach detergent directly to the inside of the shirt’s underarm area (the area touching the skin) before washing. You can also periodically wash shirts in hot water to improve cleaning. Repeat the steps above for tough odors, using distilled white vinegar to pretreat the underarm area. Don’t worry—the vinegar smell will wash out.

For your convenience, we offer three shipping options within the U.S. via USPS and FedEx:

• FREE Standard Shipping on orders $50+: Delivered within 3–5 business days
• Standard Shipping: Delivered within 3-5 business days, $3.99–$9.99
• Standard Overnight: Delivered within 2 business days, $25-$40

Actual delivery times and cost are subject to change based on unexpected carrier changes, weather conditions, and other factors outside of Thompson Tee’s control. Shipping to Canada and other international destinations is handle by USPS in partnership with local carriers in the destination country.

• Shipping cost can fluctuate without notice. For instance the Overnight shipping cost can be much higher than $40 as estimated above depending on delivery address.
• USPS manages the shipment while in the US but the package will change carriers multiple times during the journey outside of the US.

Please visit our Shipping and Deliveries page for more information.

Free shipping is available for domestic orders over $50. Standard USPS and FedEx shipping rates apply to all other orders. Check out our Shipping and Deliveries page for more information.

Yes! We ship Thompson Tees across the globe. Please visit our Shipping and Deliveries page for a comprehensive list of countries we ship to, along with our international shipping rates and terms and conditions.

If we receive your order before 12:00 p.m. PST, we do same-day shipments on business days (Monday–Friday). Overnight shipments must be placed before 11:00 a.m. PST Mon-Thurs for next day delivery.

Yes! We provide tracking numbers in your order confirmation email. Use it to track your package using USPS’s or FedEx’s tracking programs from your device.

We strive to process orders quickly, which means changes may not always be possible once your order has been placed. However, if you need to modify or cancel an order, please give us a call at 888-579-6675 as soon as possible. We’ll do our best to accommodate your request.

While we sympathize, Thompson Tee is not responsible for package theft or related issues post-delivery. Please contact the mail carrier for further instructions if such an event occurs.

Customers are responsible for customs fees, taxes or other applicable charges. Many orders are cleared through customs without issues, but agencies in your country may require you to pay additional fees.

You are responsible for checking with your country’s Customs Office to verify and pay any fees, as we cannot provide the exact amount of the charges. By completing your order, you agree to pay all applicable fees. For more information, please visit our Shipping and Deliveries page.

We’re so confident you’ll love your no-sweat Thompson Tee that we guarantee it. If you are unsatisfied for any reason, you may return the item for a full refund within 30 days of the order date. Feel free to wear and/or wash the product before returning it. Your return shipping is free.

Learn more on our Return Policy page.

We offer free return shipping for all domestic orders under our 30-day guarantee. Please fill out a return form to start a return request, and a label will be provided to you.

Please allow 5-10 business days for your return to be processed once it is received. Any credits or charges will be issued to the original form of payment unless otherwise indicated by Customer Service.

We have a team of friendly Customer Service agents ready to assist you as swiftly as possible. Please email us at support@thompsontee.com, and one of us will get back to you shortly.

Please contact us regarding any order concerns via phone, chat, or email. Our Customer Service team is available Monday through Friday from 8:00 a.m. to 5:00 p.m. PST, except on holidays.

Please note that individual items from a pack cannot be returned. If you wish to return any individual item from a multi-pack, you must include all items in the pack for a full refund.

We offer a 30-day return guarantee on all purchases, for any reason whatsoever.

If you need a different size or fit, please fill out our return request form, and one of our agents will get back to you with more details. You’ll be able to place a new order for your desired size.

Thompson Tee has satisfied over 200,000 customers in 135 countries around the world. Our customers use Thompson Tee products to feel more confident and comfortable in a wide variety of settings, including education, business, hospitality and more. They’ve relied on Thompson Tee to help them deal with sweat stains, embarrassment and medical conditions like hyperhidrosis.

But don’t just take our word for it—check out our customer reviews of the Thompson Tee here!

Your complete satisfaction is our top priority.

Our Customer Service team is happy to help answer your questions, address your concerns, and field any other issues you’d like to bring to our attention. Have a novel way you’ve used one of our products? Want to know about future plans? Please don’t hesitate to reach out at any time!

The best way to get in touch is to email us at support@thompsontee.com.

You can buy any Thompson Tee product on our website. Thompson Tee products are also available through Amazon in the US, Canada, and the UK, as well as select retailers like Men’s Warehouse.

Yes! We gladly offer free returns on all opened or used Thompson Tee products up to 30 days from the purchase date, for any reason whatsoever. Feel free to wear it and wash it.

We accept all major credit cards and debit cards and most popular digital payment portals. For instance, we happily accept PayPal, PayPal Pay Later, Amazon Pay and Afterpay payments.

Yes! We offer gift certificates via email in $25 increments up to $300. Recipients can redeem them exclusively at thompsontee.com. Buy one now on our Gift Certificates page.

Get 15% off your next purchase by subscribing to text message notifications from Thompson Tee—and many more discounts to come! Text THOMPSON to +1 (833) 208-9588 to join.

Visit our Discounts & Coupon Codes page to learn more.

Yes! If you’re excited about Thompson Tees and have a network you can tap into, we’d love to chat about how we can work together. To register, visit our Affiliate Registration page.

Yes! As a Thompson Tee rewards member, you’ll earn points every time you shop with us. The more points you earn, the closer you are to acquiring exclusive rewards like free shirts, early access and savings. Points are only awarded when shopping on the Thompson Tee website.

Best of all, it’s completely free to sign up. Visit our Rewards page to register today.

We regularly send emails out to our subscribers about general or product-specific restocks. Be the first to get these updates by subscribing to our newsletter or following us on social media!

We love our customers! If you have other questions, comments or concerns that aren’t addressed above, or you want to share something with us, don’t hesitate to reach out!

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