Foguard 3D Silicon Mask / Yellow Dust Mask / Fine Dust Mask / Anti-Fogging Mask - Great For Biking, Jogging, Climbing, Out Door Activities - Universal Size Made of 100% non-toxic, human friendly silicon nose mold and worldwide patent pending Silicon + PE Fabric adhesion technology, The mask also comes with easy to use length stopper. Unlike other masks in the market, This great 3D silicon mask does not disturb your eye vision over the glasses(goggles) since its built in soft silicon nose mold blocks your breathing fog with 98% efficiency when wearing a mask with glasses. The foguard mask offers the worlds most powerful filtering technology in its class against fine dust, yellow dust, stink, odor, exhaust or smoking fog/smell etc.., It looks simple but combines 3 layers including PE+PU & Patented sticky Silicon filter & Microfiber Kolon Coolmax moisture proofing fabric. Unlike other products in the market, It provides the most convenient breathing experience even with its nose mold blocker while completely blocking any dusts as its sticky silicon filter gathers them like magnet and stop penetrating through the mask itself. Another BIG Advantage of this mask is that it can be freely washable & re-usable. You can wash it and re-use it for continuous 4 months of uses.