Mountain Hardwear's classic zip base layer Size: M. However, it's a US size, so it's a Japanese L. Color: Gray Very roomy and soft, easy to wear. I bought it online, but it was too big, so I'm selling it. This long-sleeve shirt is 100% polyester with enhanced moisture wicking and quick-drying properties. Although thin, it is tear-resistant and highly abrasion-resistant, making it perfect as a first layer for mountain climbing. The waffle structure helps to wick sweat away from the skin, keeping you comfortable. The material is also opaque, so you can wear it with confidence. The shoulders move smoothly. Features ● Easy-to-move arm design due to the material's stretch and three-dimensional cutting ● Half-zip for easy temperature adjustment ● Flat seam construction ● Opaque material used #MountainHardwear #mont-bell #climbingwear