The "Laser Underwear Boxer-Short XL Coloured" are typically close-fitting boxer-briefs in an XL size and various colors, featuring:

Laser Cut/Lasercut Technology: This key feature means the edges (especially the leg openings) are cut with a laser, resulting in a flat, seamless finish.

Invisible Under Clothes: Due to the lack of traditional seams, they are designed to be smooth and not show visible panty or underwear lines under tight-fitting outerwear.

Comfort: Made from soft, flexible, and often stretchable fabric (like cotton/elastane or polyamide/elastane blends) for a "second skin" feel.

Coloured: They are available in a range of colors beyond just basic black, white, or nude.

In short, they are XL-sized, seamless, comfortable, and invisible-line boxer shorts/briefs offered in assorted colors.