PAPERSKY WEAR HIKE&BIKE CAVE BIG HALF SHIRTS - SAX) Size: S Never used in the mountains, only tried on. It's not overly large, so I don't think there will be any issues while wearing it. There are wrinkles, but otherwise, it's in good condition with no stains, scratches, or dirt. Thank you. The material is a typewriter cloth made of 100% polyester CAVE yarn with a cotton-like touch. The CAVE yarn, with its irregular cross-section, increases the surface area of the yarn, quickly absorbing and dispersing water. It's a functional material that dries quickly after washing and hanging in a spin dryer.