From sun protection to running in the rain, the On Lightweight Cap has you covered. On created the one-size-fits-all Lightweight Cap from tear-proof woven fabric for durability and added a soft sweat band to keep you dry and comfortable. You can also dial in the fit with the running hat’s clip-pull sizing. Laser-cut ventilation holes near the temples give you excellent breathability and help keep the hat’s feathery weight. Plus, the material is quick drying, so you’re in good hands whether your pouring sweat or the sky is pouring rain. Want more On? Check out all the On running shoes and apparel you need to keep going.