Sherlock Holmes once said he would be lost without his Boswell… and you’d be lost without this mask. Your new trusted associate accessory, The Watson, symbolising modesty and honour, this design is an homage to our favourite doctor. It’s elementary, after all. Unique Lab tested British Military Filtration Technology filters almost 100% of pollution, gases, and bacteria and viruses. Ideal for people at risk of respiratory diseases, living in or travelling to areas with high air pollution / smoke levels Protection against harmful gases, odours, all PM; PM2.5, PM0.3, pollen, smoke, allergens and pathogens The world's most trusted reusable anti pollution mask now with adjustable straps, perfect for travel, especially to China or India. Presented in eco-friendly packaging for storage, fashion friendly designs available in 5 sizes suitable for the whole family!