1. Product Overview
The RBX Active Men's Crewneck Undershirts are designed for comfort and performance. Made with soft, moisture-wicking fabric, these short-sleeve undershirts are suitable for various activities and everyday wear. The tag-less design enhances comfort by preventing irritation.

Image 1.1: Front view of the RBX Active Crewneck Undershirt. This image displays the shirt's fit and crewneck design on a male model.

Image 1.2: Side view of the RBX Active Crewneck Undershirt. This image highlights the short sleeve length and overall silhouette of the shirt.
2. Setup and Initial Use
2.1 Unpacking
Upon receiving your RBX Active Crewneck Undershirts, carefully remove them from the packaging. Inspect each shirt for any manufacturing defects or damage.
2.2 Pre-Wash Recommendation
It is recommended to wash the undershirts before their first wear to remove any residual manufacturing treatments and ensure optimal comfort and hygiene. Refer to the 'Maintenance' section for detailed washing instructions.
3. Operating (Wearing Instructions)
These undershirts are designed for versatile wear, either as a base layer or as a standalone top for active or casual settings.
- As an Undershirt: Wear beneath other garments for an added layer of comfort and moisture management. The soft, tag-less fabric minimizes bulk and irritation.
- For Active Use: The moisture-wicking properties help keep you dry during physical activity. The lightweight stretch fabric allows for a full range of motion.
- Casual Wear: The simple crewneck design makes it suitable for everyday casual wear.

Image 3.1: Undershirt in active use. This image demonstrates the shirt's suitability for physical activity, highlighting its flexible and comfortable design.
4. Maintenance
Proper care will extend the life and maintain the performance of your RBX Active Undershirts.
4.1 Washing Instructions
- Machine Wash: Use a delicate cycle with like colors.
- Water Temperature: Cold water is recommended to preserve fabric integrity and color.
- Detergent: Use a mild detergent. Avoid harsh chemicals or bleach, as these can damage the fabric's moisture-wicking properties.
4.2 Drying Instructions
- Tumble Dry: Use a low heat setting.
- Air Dry: For best results and to prolong garment life, air drying is recommended. Lay flat or hang to dry.
- Ironing: If necessary, iron on a low setting. Avoid direct contact with any printed logos or designs.
5. Troubleshooting
5.1 Fit Issues
If the undershirt does not fit as expected, please verify the size against the provided size chart. Garment fit can vary based on individual body types and preferences. If the size received does not match the size ordered, check the garment's tag and contact customer support if there is a discrepancy.
5.2 Fabric Feel
The undershirts are made from a blend of 90% Polyester and 10% Spandex, designed to be soft and moisture-wicking. If the fabric feel is not as expected after washing, ensure that care instructions have been followed correctly, particularly regarding detergent use and avoiding fabric softeners which can sometimes alter fabric texture.
6. Specifications
| Feature | Detail |
|---|---|
| Model Number | AABX3857 |
| Brand | RBX |
| Fabric Type | 90% Polyester, 10% Spandex |
| Design | Short sleeve, Crewneck, Tag-less |
| Key Features | Soft, Moisture-wicking, Quick-drying, Lightweight stretch fabric |
| Package Contents | Two (2) undershirts |
| Care Instructions | Machine wash with like colors delicate cycle |
7. Warranty and Support
For information regarding product warranty, returns, or customer support, please refer to the retailer's policy where the product was purchased or visit the official RBX website. Keep your proof of purchase for any warranty claims.
RBX Official Website: Visit the RBX Store on Amazon