Here's an enhanced, engaging product description suitable for an e-commerce site, based on the information I found online using the provided EAN and your instructions:

```markdown

Russell Athletic A40261: The Technical Shirt That Pushes You Beyond Your Limits

Feel the power, freedom, and comfort that only a performance-driven shirt can offer. The Russell Athletic A40261 short-sleeve shirt is the perfect ally for all your workouts, from morning runs to intense gym sessions. Forget distractions and focus solely on your goal: exceeding your limits.

Comfort and Performance in Perfect Harmony

Made with high-quality technical fabric, this shirt ensures optimal breathability, keeping you cool and dry even during the most intense efforts. Its lightness allows you to move freely, without restrictions, for uncompromising performance. The ergonomic cut is designed to fit your silhouette perfectly, offering superior comfort and an impeccable athletic look.

Essential Design, Extraordinary Performance

The Russell Athletic A40261 shirt stands out for its clean and minimalist design, perfect for those seeking a sober but performing style. The Russell Athletic logo, discreet but unmistakable, is a symbol of quality and reliability. Available in various colors, it easily matches any sports outfit, allowing you to express your personal style even during training.

Ideal for Every Sport Activity

Whether you're an experienced runner, a fitness enthusiast, or a team sports lover, this shirt is the ideal choice to face any challenge. Its versatility makes it suitable for any physical activity, always guaranteeing maximum comfort and freedom of movement. Wear it for:

Running: Enjoy a smooth and uninterrupted run thanks to the breathability and lightness of the fabric.

Training: Face your gym workouts with maximum freedom of movement and optimal comfort.

Team Sports: Support your team with a technical shirt that allows you to give your best on the field.

Leisure Time: Wear the Russell Athletic A40261 shirt even in your free time for a sporty and casual look.

An Investment for Your Well-being

Don't settle for just any shirt. Choose the quality and reliability of Russell Athletic and invest in your well-being. The A40261 shirt is a durable and long-lasting garment, designed to accompany you in every sporting success. Take care of it by following the simple washing instructions and enjoy its performance for a long time.

Choose Your Size and Start Exceeding Your Limits Now!

Available in sizes from S to XXL. Consult our size guide to find the perfect fit for you. Don't miss the opportunity to improve your performance with the Russell Athletic A40261 shirt. Add it to your cart now! ```