PIP Smooth Dome Hard Hat HDPE Graphic 280 HP341R MEX Size:OS Does not comply with the Lined and insulated Does not comply with the flame resistant requirements of ANSI ISEA 107 2015 Standard as a FR garment Waist Width (Min) Waist Width (Max) Center Back Length SKU SM MD 38 50 19 1 2 5510P0C LG XL 43 55 20 1 2 5510P0G 2X 3X 48 60 21 1 2 5510P0L 4X 5X 53 65 22 1 2 5510P0Q + 1 1 1 All measurements are in inches to the exterior of the garment It includes a comfortable 4 point nylon webbing suspension with SURE LOCK ratchet adjustment for a secure fit this hard hat is perfect for welding applications and features a rain trough and slotted design for accessory compatibility