UV rays are so strong on the mountain that taking measures to avoid sunburns is necessary. Sunscreen and sunglasses are must items. Sunscreen will run off from sweat even after being put on once. Put it on again frequently. Sunglasses are not just for blocking out blinding light, but also absorb the UV rays to prevent the darkening of corneas since melanin pigments make skin get a tan after corneas absorb the UV rays. Sunglasses that fully cover the eyes are recommended.