G-Form Pro-X4 Long Sleeve Bike Jersey A Breathable MTB Jersey When you're out mountain biking, you'll want to wear apparel that is lightweight and breathable to keep you cool and dry. The G-Form X4 Long Sleeve MTB Jersey is made of breathable UPF 50+ fabric and is perfect for any biking environment. It is made of 88% polyester/12% spandex. Features Breatable UPF 50+ fabric that wicks moisture to keep you cool and dry Perfect for mountain biking and casual wear Machine washable so you can always smell fresh SPECIFICATIONSMaterial88% Polyester, 12% Spandex Sleeve Length Long Sleeve Closure Type No Zipper Fit Casual Fit Intended Use MTBSpecial Features UPF 50+Sizing Size Small Medium Large Extra Large Chest (in)32 - 36"36 - 40"40 - 45"45 - 50"Chest (cm)81 - 91. 5cm91. 5 - 101. 5cm101. 5 - 114cm114 - 127cm | G-Form | Pro-X4 L/s Bike Jersey Men's | Size Small In White | Spandex/polyester