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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...
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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...