This is Montbell's Geoline. I wore it a few times a year when skiing. There is some pilling from use, but there are no noticeable flaws. The following is from the official website: Lightweight and quick-drying, this underwear is suitable for situations with a lot of sweating. It is versatile and can be used all season. It has a soft texture with little constriction, so it is comfortable to wear and doesn't feel stressful. It excels in water absorption, diffusion, and odor resistance. This is a boys' version with a front opening. - Brand: mont-bell - Style Number: 1107599 - Size: 135 - Color: Black Thank you for looking. Gender: Boys