This is Zett's baseball compression training wear. I was forced to buy it for high school baseball. The top and bottom set cost a little over 40,000 yen. Sizes are: Top - O size, Belt - M size Bottom - L size, Belt - M size Used for 2 years. There is some wear on the pants. All the names have been written on and erased. Please understand and purchase. There is an instruction manual. I will ship it together. For those who fit the size, please consider. My son has a slender build, so I think the belt is M size.