Move effortlessly with the JUNK Brands Aero Hat: lightweight, breathable, and built to keep up with your every move. Wicking JUNK FLX Lightweight Water Repellent UPF 50+ Breathable Fit & Fabric Fit: Two size options, our flexible JUNKFLX sweatband, and a soft-snap TPU closure work together to deliver a secure, ultra-comfortable fit for virtually any head shape. Fabric: Built from our durable Elemental stretch fabric (86% nylon, 14% spandex), this hat repels water, dries quickly, and stands up to heat, sweat, and whatever the day throws at you.