This is the SUBEA full-face snorkeling mask "EASY BREATH 540". https://www.decathlon.co.jp/products/adults-easybreath-surface-mask-acoustic-valve-540-freetalk-jungle?variant=41265864736848 I purchased this overseas approximately 3 years ago and used it several times for snorkeling in the ocean. It shows signs of use, but there are no issues with its functionality. Size: ・S-M Condition: ・Shows signs of use ・No major damage or cracks ・Lightly cleaned Notes: ・Please purchase only if you understand that this is used marine equipment. ・Please refrain from purchasing if you are looking for a perfect condition item.