The 100% cotton outer shell is durable and high quality. Provides excellent sun protection with UPF 50+ ARPANZA rating. This full coverage hat is ideal for those with hair loss due to chemo, alopecia, trichotillomania, or other reasons. The 48% bamboo, 47% aloe, 5% spandex lining is cooling, comfortable, soothing, and has antibacterial properties. The lining features real aloe vera fibers rather than a temporary coating, so the benefits are everlasting.