Barska 8x30 Crossover Binoculars These 8x30 Crossover Binoculars from Barska are O-ring sealed for 100% waterproof protection. Great for all weather conditions, they have been dry nitrogen purged to prevent fogging, clouding and moisture damage. The BAK-4 prisms allow for clear and crisp viewing. O-ring sealed for 100% waterproof protection Dry nitrogen-purged to prevent fogging, clouding and moisture damage BAK-4 prisms for crisp and clear images Limited lifetime warrantyCalifornia Proposition 65 Notice: This product contains chemicals known to the State of California to cause cancer, birth defects, and/or other reproductive harm.