Some models from KWIAT Comfort Collection are made entirely of phosphorescent material and glow in the dark. These are the models K069 c 201, K068 c 201 and K073 c 201: In model K046 c213 only the temples are phosphorescent and glow in the dark. The phosphorescent temple can be easily replaced with a black temple or color temple. The model K046 is with interchangeable temples. Other temple colors will be available soon for model K 046 from the collection KWIAT Comfort. And models such as K 040 c165 and K037 c165 are with fully phosphorescent front and can easily find them in the dark room. This is especially useful for people who tend to fall asleep in bed when reading, and then often seek their glasses among the covers. Phosphorescent material used in KWIAT Comfort collection has all the necessary parameters for lightweight, comfortable and high-quality sunglasses. Any diopters can be mounted on them. We wish you an enjoyable choice in the optical salons of our new and extremely comfortable KWIAT Comfort models.