【See through and fly can't pass】After Professional analysis,99% adult flies body over 1mm.Our mesh hexagon hole 1mm,so um see fly can't pass.The black colar mesh also nothing glaring instead of light colar mesh. 【Fixed when body moving 】Metal ring fixed round let mesh natural falling near the shoulder,make out one round space. 【Lightweigt hat】We use lightweight fabric make hat.The hat normally 33CM diameter,The hat 55-60cm head circumference. Beekeeping Veil Hat Bee Keeper Hunting Net Cap Beekeepers Costume Gnats Insect Bug Mosquito Mesh Hats for Men Women