The First Product Guarantee lets you try one sweat proof undershirt and one pair of sweat proof boxer briefs. If it’s not the right fit, feel, or performance for you, you can request a different size or a refund.

The First Product Guarantee applies to:

• One sweat proof undershirt
• One pair of sweat proof boxer briefs

Only single units are eligible.

Key details

• Valid for first-time purchases only
• You have 45 days from delivery
• Applies to size changes only (not style or color changes)
• Refunds apply to the product cost only (shipping, duties, and taxes are not included)
• Bundles and multi-packs are not fully eligible. The First Product Guarantee applies to one item only. 
• Essential boxer briefs and clothing items are not eligible.

If your first order includes multiple items, we recommend trying on one item first before opening the rest.

If the first item isn’t right, the remaining unopened items can still be returned under our 45-day return policy.

Email us at support@ejisinc.com with your order number and let us know if you'd like a different size or a refund.

Please do not use the return portal for First Product Guarantee requests.

No. The First Product Guarantee only covers size changes. A replacement will be provided.

If you would like a different style or color, please use our 45-day return policy.

If your item qualifies for our First Product Guarantee, please follow those guidelines instead.

Undershirts and boxer briefs must be returned in new, unworn condition. This means they must be unopened and not tried on.

For hygiene reasons, we are unable to accept returns of underwear that has been opened or worn.

All other products must be returned in their original condition, unworn and unwashed, with all tags attached and in original packaging.

All returns are inspected and must meet these criteria to be eligible for a refund or exchange.

If the First Product Guarantee does not cover your order, you can return or exchange eligible items within 45 days of purchase.

To start a return or exchange, visit our Return Portal and enter your order number and ZIP code.

For gift returns, select “Start Gift Return” and enter the requested information.

If you need help, contact us at support@ejisinc.com.

Customers are responsible for return shipping costs.

We use this feedback to improve our products and better understand our customers’ experience.

Refunds are issued after your return is received and inspected. Please allow 3-5 business days for the refund to be processed to your original form of payment.

For complete details, please see our full Return Policy

Ejis sweat proof products use a built-in, multi-layer system designed to help prevent visible sweat.

A soft, breathable fabric sits against the skin, while a thin, waterproof layer is integrated into key areas to block moisture from reaching the outside. This targeted protection is placed where it’s needed most, such as the underarms for undershirts and the seat and inner thighs for boxer briefs.

All sweat proof products also include fabric technology designed to help reduce odor buildup over time.

The result is lightweight protection that helps keep your clothes dry and comfortable so you feel more confident.

No. Ejis products are designed to help block visible sweat from reaching your outer clothing. They do not stop your body from sweating.

The sweat protection is built into the garment in targeted areas where sweat is most likely to occur, such as the underarms in undershirts and the seat and inner thighs in boxer briefs.

The sweat protection includes a thin, waterproof layer designed to block moisture in targeted areas.

While the surrounding fabric is breathable, the protected areas may feel different from a standard undershirt or boxer brief. Most customers find it comfortable for everyday wear, but comfort can vary depending on personal preference and environment.

All Ejis sweat proof undershirts use our built-in X2 ConfidenceCore® sweat-blocking system and feature SILVADUR™ technology to help reduce odor buildup. The main difference is the fabric used for the body of the shirt.

We offer a range of fabrics designed for different preferences:

• Micro modal: exceptionally soft, smooth, and flexible with added stretch for a premium feel
• Cotton: breathable, lightweight, and more traditional in feel with less stretch
• Ultra breathable blend: designed for maximum airflow with added stretch for a light, athletic feel

Sweat and odor protection are consistent across undershirts, so the best choice comes down to comfort, feel, and how you plan to wear them.

Ejis sweat proof products are designed to be worn any time: work, travel, workouts, and special events.

Undershirts can be worn under dress shirts, t-shirts, and polos, while boxer briefs provide discreet protection under pants or shorts.

The sweat protection is built into the garment and placed where it’s needed most, so you can wear them comfortably without changing how you dress.

Proper care helps maintain performance and extend the life of your garments.

Sweat Proof Products

After wearing, remove your undershirt or boxer briefs and allow them to air dry before placing them in the hamper. This helps prevent moisture buildup and odor.

It’s normal to see staining in the underarm area over time. This is typically caused by sweat interacting with antiperspirant. In most cases, stains will wash out. If needed, apply a stain remover before washing.

Washing & Drying

Sweat proof undershirts and boxer briefs can be machine-washed and dried, but a few guidelines will help maintain performance:

• Turn garments inside out before washing
• Wash with like colors in cold or warm water on a gentle cycle
• Use the manufacturer’s recommended amount of regular detergent
• Machine dry on low heat or hang dry

Avoid:

• Bleach or vinegar
• High heat washing or drying
• Ironing
• Dry cleaning

Regular Clothing

Regular (non-sweat proof) items can be washed normally:

• Machine wash warm with like colors
• Machine dry on low
• Use regular detergent
• Avoid bleach, ironing, and dry cleaning.