This bedding is designed to prevent, treat and improve allergies to dust mites. Dust mite allergens are the main cause of atopic dermatitis, allergic rhinitis and asthma. The company has focused on the fact that the cotton in the bedding people use every day is a major cause and has worked to develop a new type of bedding that is resistant to mites, obtaining four patents in the process. With this patented manufacturing method, the company has achieved the complete elimination of causative agents through a special high-heat treatment without allowing any mites to pass through the fabric or needle holes. In addition, the side fabric that directly touches the skin is made of 100% cotton, a special high-density woven fabric, and the double-layered inner bag is also made of 100% cotton. The same method applies to covers, sheets and pillowcases, which are manufactured at designated factories in Japan without using any insecticides or other chemicals. This is a bedding that prevents dust mites and keeps the air clean and dust-free; therefore, even babies can use it safely. In addition to existing products, the company also accepts orders for custom-made products in any size required. This product is the only one that has demonstrated an improvement rate of a more than 90% elimination ratio in 751 cases in a research project conducted by the Ministry of Health, Labour and Welfare. The company has also received written confirmation from the Ministry of Health, Labour and Welfare that there are no advertising violations under the Pharmaceutical Affairs Law and the Act Against Unjustifiable Premiums and Misleading Representations. Yamasei Kankyo Allergy Kenkyujo Corp. is committed to providing products that can help people who suffer from allergy symptoms.