Within this degree project a conceptual design of a mask has been developed for people with Multiple Chemical Sensitivity due to the lack of this kind of product in the market. The users currently use different masks that are designed to be used in other activities. A preliminary study has been performed where market, ergonomics, materials and use situations have been analysed to gather knowledge to define the specifications of the product. Even if the aesthetics of the first version of the product’s design was related to a health care design style, after obtaining results, it was observed that the wishes of the users weren’t being fulfilled. After updating the specifications and the generation phase three possible concepts have been presented. The evaluation has been done within the design group and the target users from the Basque association “Bizi-Bide”. The final conceptual design has been developed regarding different aspects such as ergonomics, materials, components and graphic design. The project has resulted in a concept of an innovative mask, which has a mouldable part for the nose and cheeks, a Velcro fastener to adapt it to different head measurements and exchangeable filters.