Advantage® 420 Half-Mask Respirator, Elastomer, MediumMask can be adjusted to wearer for a comfortable fit, helping to reduce potential pressure points throughout the day Adjustable crown strap adapts to different head sizes Patented yoke and harness design enables quick and easy switch between lock down and drop down modes Dropdown mode allows users to remove the facepiece and rest it safely against the chest while maintaining use of head protection they may be wearing Lock down harness mode allows the