The popular Flecta Hi-Vis dog jackets are constructed to give maximum visibility day or night. During daylight, the fluorescent yellow can be seen from considerable distances & during darkness any light will be immediately reflected from the reflective stripes on both sides. Incorporated between the inner & outer layers of the Flecta Hi-Vis Dog Jacket is a layer of Flectalon® thermal insulation developed from NASA research into aluminised surfaces, Flectalon® can reflect up to 95% of radiated heat.