This is a pet assistance belt for large dogs. It is unopened and unused. I purchased it on Amazon about 2-3 weeks ago for 3980 yen, but I am selling it because my dog passed away before it arrived. The size is XL. According to the size chart shown in the product images, the neck circumference is 54cm (50-58), the chest circumference is 88cm (86-94), the reference weight is up to 42kg, the product's body length is 35.5cm, and the product's total length is 59cm (55-63). This is my first time selling, so there may be some unfamiliar or inadequate aspects, but I will strive to provide courteous service. Please feel free to comment if you have any questions about the product. Purchases without comments are also welcome. Thank you very much.