Introducing a monochrome series of ActiveM brand sports innerwear that is unforgettable once you wear it. Comfort innerwear and undershirt worn by over 500 professional baseball players (according to manufacturer research, as of October 2024), as well as top-class golf and bicycle racers! [Functional innerwear] Sweat-absorbing and quick-drying function / Excellent stretchability / Lightweight material / Soft fabric (good to the touch) / Side mesh processing [Quality display] Body: 94% polyester/6% polyurethane [Color] Navy, Black, Royal Blue, Red [Size] S, M, L, XL, XXL [Length/Bust/Sleeve to Sleeve (cm)] S: 66/84/35, M: 69/90/37, L: 72/96/39, XL: 75/102/41, XXL: 78/108/43 An undershirt like never before. active room. This is a single color comfort inner series that is lightweight, quick drying, breathable, and stretchy. ActiveM's lightweight innerwear provides stress-free wear that puts less strain on the body without losing its quick-drying properties. This is a unique design from the field's perspective, which is a new initiative in the industry.The arms have a slightly better fit to prevent unnecessary movement of the muscles, the traditional too-tight innerwear has been eliminated, and the torso has been made slightly looser. This prevents the trunk from twisting easily and prevents the inner layer from slipping up, which tends to happen with fitted fabrics. A functional innerwear with mesh processing on the sides. According to the manufacturer's research, it is designed to provide stress-free comfort and improve performance such as swing speed. Collarless model popular among professionals! An undershirt worn by over 500 professional baseball players! (As of October 2024) We have released a new type of comfort that is easier to move in and stress-free than ever before, and we hope that people who have avoided wearing it because of the pattern will enjoy it, so please try it out. It will be one piece.