Transparent Tempered GlassThe children's swimming goggles are made of tempered glass lenses that resist scratches and can withstand the pressure of deep water without breaking easily. 180 clear vision brings children a fun swimming experience. Leak-proof designThe skirt of this children's snorkel mask is designed with soft and flexible silicone to create a watertight seal with your child's face. It is comfortable and does not leak. It is the perfect choice for children and teenagers. Relieves pressure on the back of the head. Fits a variety of children's face shapes and is perfect for snorkelling and recreational swimming. Soft Nose Sleeve The children's swimming mask is made of a soft silicone nose sleeve, which is safe and comfortable. It is helpful for children who don't know how to stop breathing through their nose underwater. A great gift for children's swimmers.