The Arc'teryx Accelerator Long Sleeve Zip is a quick drying, mid-weight layer designed for high aerobic activities in cool conditions. Made from Shaide, a quick drying, moisture wicking polyester, the Accelerator provides light insulation and UPF 45 sun protection. The 3/4 zipper allows for maximum ventilation for when your core temperature rises and the fabric's mechanical stretch delivers exceptional freedom of movement. Arc'teryx also uses Flatlock seam construction to reduce any possible irritation so you have the most comfortable next-to-skin fit and feel all day long. [+]