MOBBY'S diving hood made for excellent cold protection, made of black neoprene. - Brand: MOBBY'S - Color: Black - Special Feature: S.E.V. (Soft Exhaust Valve) MOBBY'S unique special function that exhausts air inside the hood while preventing water from entering. ※Measurements are approximate. Size: Approximately S (custom-made) Head circumference: 49-51cm, Neck circumference: 29-31cm I received this, but the size didn't fit, so I haven't used it at all. (According to the previous owner, it was used 5-6 times.) It has been stored at home, but please understand that this is a used item.