Blocks 95% UVA/UVB rays, prevents sunburns and long-term skin damage. The brim is wide enough to provide a lot of shade without being so large that it gets in the way. Mesh venting design helps with breathing, promotes air flow which cools the head. The adjustable chin strap to keep fishing hat from blowing away in high winds. The sweatband is long enough to prevent sweat dripping into the eves and keep the face and neck dry. The interior of the sun hat is soft& breathable mesh lined,giving you more comfortable wearing experience.