It is so lightweight you\'ll forget it\'s there, but it\'s plenty robust enough to withstand trails, tracks and your own backpack. All-way stretch means you have full range of movement on downhills or screaming round curves. The lasered side vents also keep temperatures down when the incline arrives.TruDri fabric - offers excellent breathability & moisture wickingSuper-light stretch TruMotion fabric and constructionDurable Water Repellent (DWR) finish - sheds light moistureRemovable liner - dual density fabric to improve saddle comfortRace ratchet closure - secure and quick adjustment to fitBody-mapped laser-cut side ventsFabric: 87% polyester / 13% elastane