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Like it says in the other comment, these glasses are to be used when belaying so that you don't have to tilt your head up. The lenses are made of a prism-shaped glass that bends the light in such a...
Like it says in the other comment, these glasses are to be used when belaying so that you don't have to tilt your head up. The lenses are made of a prism-shaped glass that bends the light in such a...