The Portuguese man-of-war situation in Chiba is bad, so I bought this new online, but the size didn't fit. It's new, only tried on. US M, which is a Japanese L. Short zipper on the lower back. 【US M Size】 Height: 177-185cm Neck: 38cm-39cm Shoulder Width: 46cm Chest: 96cm-101cm Sleeve Length (from center of neck): 85cm-88cm Arm Circumference: 34cm VOLCOM Men's 2MM NEOPRENE JACKET LS Long Sleeve Neoprene Jacket 2mm A jacket that stylishly handles various coastal situations. Made of a technical blend of 2mm nylon and neoprene, it has 50+ UV protection and a smart, classic look. ※This product is an import item! Some import products are larger than Japanese sizes, so be sure to check the actual size before purchasing. 2mm Neoprene Back Zip Jacket Glued and blind-stitched seams 50+ UV protection Outer Material...Jersey Lining...Standard Thickness...~3mm Gender...Men's Size...M Sleeve...Long Sleeve Size...L