Get this 4-pack of versatile wave caps that work for everything from sports to sleep! Made from polyester and nylon, they're stretchy, breathable, and super comfortable. The classic dome shape fits most adults and teenagers perfectly, with a diameter of about 9.84 inches that you can adjust by stretching. The elastic band is just right - not too tight to leave marks, but secure enough to stay put all night. Use them as helmet liners for biking, motorcycling, or skiing, or wear them for running, hiking, fitness, and dancing. They're also amazing as sleep caps to maintain your waves and reduce hair frizz. The moisture-wicking material keeps you cool during activities and warm in colder weather. With four colors in the pack (black, gray, military green, and sky blue), you'll always have a fresh one ready. They're lightweight, easy to pack, and hand washable for convenience. Whether you're into hip-hop culture, sports, or just want to protect your hair while sleeping, these caps deliver both function and style. They make fantastic gifts for fathers, cyclists, or anyone who appreciates practical headwear!