Waterproof : Protected By Durable, Waterproof Neoprene Skin To Withstand All Weather Conditions, Ensuring Years Of Thrilling Outdoor Sports Games. Glow In The Dark: After Just 15 Minutes Of Strong Light Exposure, The Volleyball Glows In The Dark For 30 Minutes. With Weak Light Exposure, It Can Glow Continuously For Up To 8 Hours. Versatile Outdoor Fun: Elevates All Your Outdoor Adventures, Whether At The Pool, Beach, Lake, Park, Or Even In Your Backyard. Soccer Gifts: These Glow-In-The-Dark Balls Make Perfect Sports Gifts For Boys And Girls, For Birthdays, Holidays, And Other Special Occasions. Sports Games: This All-Purpose Sports Ball Has A Diameter Of 8.2 Inches.