★Fabric ：The Kinno Scuba animal cartoon characterized diving hood is made with 3-millimeter Premium Neoprene, Smooth neoprene in excellent shape and right size with no fluff forming unlike poorer quality ones. ★Design Features：it features a smart design that allows air bubbles to escape without causing water entry and that can conform to your specific anatomy. The hoods integrated air vent allows bubbles to escape through the top of the hood, preventing ballooning without promoting water exchange. Good seal, no mushroom head and will warm my head Technical ★Size Selection ：This Hood is free size, Velcro designed to adjust the size of the hood. Don’t adjust too loosely . Too flabby the hood will affect the warm-keeping underwater. ★Maintenance：Do not use chemical reagent like laundry detergent or powder to clean the hood. Just clean with clear water and naturally dry it in shade. ★Special Note: About the hole. There is a small hole in the top of the head, not the product is broken. It says here that the bubbles will come out of here. About Wrinkles The diving material in dry condition when fold it there will have wrinkles. They will be flat itself when underwater for diving material will expand in water. About Flavor The hood is sealed by glue before sewing up, so there will be remaining glue flavor. Put the hood in air for ventilation for 2days or after use in water, the flavor will fade away.