Adult Reusable Mask (BUY 1 GET 1 FREE) Remark to seller for 2 options selection Reusable Adult mask with filter inner pocket - Breathable Cotton - Anti-Pollen - Anti-Dust - Micro-Particle Barrier - 8 designs available - Adjustable elastic sidebands with lock buckle for easy wearing - Waterproof - Size : 21cm x 13cm Important note: - Please wash the mask before wearing - Wash mask by hand with soap and water, then air dry mask - Avoid the use of bleach