RZ Mask Air Filtration Dust and Pollution Mask M2 Mesh - Black - BONUS Includes 5 F1 99.9% Filters Medium;

Choosing the correct mask size To determine the correct mask size for your facial structure, we recommend taking exact measurements using the method described below. 1. Measure from the bridge of your nose to just under your chin. *See guide below. (It may be helpful to have a friend assist you) 2. Use the measurements you have taken and match to the best fit from the below: NOTE: If you are on the bubble based on measurements - refer to weight. Extra Large (XL) - 4.5" - 5.5" | 215lbs + Large (L) - 4" - 4.5" | 125lbs - 215lbs Medium (M) - 3.5" - 4" | Up to 125lbs