If you have employees that work in a Shop but are constantly having to go to the yard or other buildings on site, then a pair of Crews Klondike KD119 Indoor / Outdoor Lens safety glasses may be a welcomed pair of safety glasses for those employees. If it's also hot, humid and sweaty then a pair of indoor / Outdoor Klondike Anti-Fog ( AF )lens is what you need. Klondike Indoor Outdoor lenses turn gray, and almost mirrored when outside, deflecting light, then self correct back to a clear lens as the user moves back inside in normal shop lighting conditions. When it gets hot and sweaty, then safety glasses can fog up causing poor visibility. A pair of Klondikes with AF lenses can fix that. A wise choice for those working in changing lighting conditions. Another benefit is these safety glasses just feel good to wear, they have soft nose pads, soft ear pads and they have a ratchet adjustment that can make them a perfect fit for every wearer. More importantly, they provide great eye protection which is the number one criteria. A wrap around lens that gives great eye protection while in use.