This is the EL LAB. DETACHABLE SLEEVE L/S TEE in BLACK. 2024 SS This is an EL LAB. product, but the brand name is not listed, so I'm borrowing it. It's in relatively good condition, I think. Quoted from the official website below: ■ The front and back of this item use INVISTA's ultra-thin (15 denier) CORDURA® ripstop nylon fabric. The features of this CORDURA® include ultra-lightweight, stretch, breathability, water repellency, and abrasion resistance. It is also quick-drying, so you can wear it comfortably even in the summer when you sweat a lot. ■ The raglan sleeves and the back of the neck use stretchable Asahi Kasei's ROICA® 2WAY high-stretch tricot. In addition to stretchability, it also has a cooling touch function, and the fabric selection is designed to make you feel a little cooler in the spring and summer seasons. ■ The back of the neck is designed to stretch firmly when putting your head through, allowing for a beautiful neckline without widening the neck width. ■ The sleeves are detachable with dot buttons, allowing them to be changed from long sleeves to short sleeves. The point is that it is not limited to the summer season, but can be used for a long season from spring to summer and then to autumn. ■ COOL DOTS® mesh material from Komatsu Matere is used from the elbow to the cuff, so it is breathable and you can use it without stress even during the humid rainy season. ■ The sleeves and underarms are switched and gusseted to make it easier to move your arms up and down, and COOL DOTS® mesh fabric from Komatsu Matere is used to emphasize the breathability of the underarms. ■ Mesh fabric is layered on the back of the front and back body parts so that the fabric does not stick to the skin when you sweat. ■ A drawcord is provided at the hem, and the hem width can be adjusted like a blouson. ■ There are two zippered pockets on the front, one on each side, so you can use them like the pockets on an outer. This item, which is particular about the details, is completed as a tech T-shirt that is completely different from conventional T-shirts. ARC'TERYX VEILANCE Acronym DESCENTE ALLTERRAIN Goldwin TEATORA