The Phillips Fitover is a comfortable, lightweight, and durable black rubberized nylon frame that is designed to fit over prescription eyewear. These glasses will fit over almost any style of glasses with comfort. Even if you don't wear prescription glasses these rubber frames are a comfortable fit and wear. Phillips Boroscopes are designed to meet the need for the extra UV and IR protection needed when working on borosilicate glass. Phillips Boroscopes are specially formulated glass filter lenses that Phillips Safety Products exclusively owns. These lenses have been developed for the lampworking and glassblowing markets. This revolutionary product is greatly lighter than conventional laminated products and comes in a full coverage lens which this is a higher quality design because there are no areas without shading. Boroscopes should be worn when working on hard glass types where regular didymium or Phillips202/ACE are not adequate due to the fact of insufficient filtration of ultra violet and infra-red absorption. Boroscopes are available in a Phillips 3 or 5 depending on your personal preference.