These arm covers are suited for spring and summer trekking and hiking, protecting your arms from the sun's rays. Made with Wickron™ COOL, they dry quickly and are extremely breathable. These arm covers are cool and will keep you feeling dry, even under the blazing sun. A photocatalytic agent added to the polyester fibers controls odors. A rubber band in the sleeve can be used to adjust fit and keep the arm cover from slipping during activity. These arm covers also use Slan-tec cuffs it improve fit and comfort in the wrists.