This report is a final thesis project written at the Technical University of Jönköping and was done in cooperation with the company Sundström Safety AB. The project discussed in this report is about product development, where two concepts are to be developed from two existing lightweight hoods SR 561 and SR 562. Lightweight hoods are a protective device used in critical environments. Lightweight hoods are used in chemical environments to protect the user from the hazardous environment. The current products are considered to be slightly hard to use in case of equipping and removing the products, and therefore Sundström Safety AB wants to develop new concepts for these two products. Standards that restrict and claim the product are specified by the company and a literature review is made on these to define the requirements on the product. These requirements are compiled and on the basis of them, concepts are created by following the design process. Different methods such as brainstorming and idea sketching are used to generate concepts that are then screened with screening methods such as Pugh's matrix. After only two concepts remain, a concept for a reusable lightweight hood and a one- time use hood concept, a final prototype is made. This prototype is made on the reusable concept as it has the most features. The prototype is manufactured using 3D printing as well as other plastic details. The concepts created in this report may be used for Sundström Safety AB in the development of the current products. The concepts can give an idea of how new products can be developed and inspires to new solutions of the lightweight hoods.