This is a Lululemon Metal Vent Tech men's long sleeve t-shirt in blue, featuring a crew neck and pullover closure. The shirt is designed for activewear purposes, with a lightweight, breathable, and stretchy fabric that is ideal for gym training and running. The size is medium, and the style is basic, making it a versatile option for various physical activities. The brand is known for its high-quality performance wear, making this shirt a reliable choice for active individuals. Size is unknown. No size dot. See photos for measurements