These 10x42mm binoculars will not slip out of your hands thanks to the textured grip. Adjusting the focus is child’s play due to the large central knob. You can twist the eye cups to your liking to relieve your eyes, also possible with eyeglasses on. These binoculars are O-ring sealed and nitrogen-filled for complete waterproof and fog-proof durability. - 10x42mm - Waterproof - Fogproof - Nitrogen charged - O-Ring sealed - Twist-Up eyecup