Flexibility with very good impact resistance and thermal insulation. Spectrum S-Flex 98A Glow in the Dark is enriched with a concentrated phosphorescent pigment that creates the effect of phosphorescence. Spectrum S-Flex 98A is a filament based on thermoplastic polyether polyurethane. In the field of additive manufacturing, S-Flex 98A is a material characterized by a relatively simple and trouble-free 3D printing process. It has very good adhesion of the first layer of the printed part to the print bed, whether it is made of glass, steel, plastic, or another material. Low processing shrinkage and very high flexibility reduce the risk of warping edges of the manufactured parts. The filament name 98A refers to the hardness of the material on the Shore scale and classifies S-Flex 98A in the category of hard elastomers. This property, from the perspective of the 3D printing process, reduces the risk of deformation of the filament in the feed system from the filament to the print heads. This allows for a slightly faster print compared to other, more sensitive elastomers. The additively manufactured parts made from S-Flex 98A exhibit very high hydrolysis resistance, good recyclability, and excellent resistance to dynamic forces. Thanks to these properties, it is possible to print 3D printed parts for the protection of impact-prone surfaces, sealing and protective elements with high chemical resistance, and thermal insulators.