The bug hat features a 18.9" ultra-long breathable mesh net, offers exceptional protection from bites of mosquitos, insects, and bees.The mesh net is desighed to allow airflow, keeping you comfortable even on a hot summer's day. The wide brim effectively shades your face, neck and ears, while the UPF 50+ fabric blocks out 98% of harmful UVA and UVB Rays. Giving you peace of mind and a worry-free outdoor experience. One size fits most adult head sizes between 21.7"-23.3". The hat features an adjustable buckle at the back, allowing for a perfect fit regardless of head size. And the chin strap holds hat remains securely in place even during windy days.