Sharkskin Chillproof Short Sleeves are machine washable and the fleece material is anti-itch, making it a good fit for most sensitive skins. The Sharkskin material consists of 3 different layers to give the Sharkskin undergarments a few awesome features. It is water deterrent which means it doesn't soak up a whole lot of water and will dry fast. Sharkskin Chillproof is designed to prevent the wind-chill from going through so it keeps you warmer on the surface as well. It's designed to have a 4-way stretch so it should fit comfortably on your body. A few other great features are that Sharkskin Chillproof is odour-resistant, neutrally buoyant, and anti-microbial.