Mission Matrix Camo Silver Cooling Bucket Hat. Explore a new hiking destination or just your own backyard with the Cooling Bucket Hat. The design and special features of this hat keep your face, ears, and neck protected from harmful UV rays with wide brim coverage and UPF 50 fabric while it cools instantly when activated with water. It stays cool for up to 2 hours allowing you to continue doing what you love in the heat. One size fits most. Brim 3". Minimum size 24". Maximum Size 24". 100% polyester.