Neoprene elastic strap matches the chosen color of sunglasses and allows for flexibility, breath ability, and comfort side adjust velcro allows for years of wear as the child grows * Each pair comes with its own protective bag which doubles as a lens cleaning cloth lenses 100 percent uva/uvb protection category 3 lenses offer high sunglare reduction and good uv protection durable polycarbonate opthalmic quality Neoprene elastic strap matches the chosen color of sunglasses and allows for flexibility, breath ability, and comfort side adjust velcro allows for years of wear as the child grows