Wool Size 90: 1 piece Size 80: 2 pieces (They seemed to have shrunk from the time of purchase, and were all equivalent to size 70) Cotton (waterproof) Size 70: 5 pieces I purchased all of these on Mercari. I'm selling them because my child has outgrown them. The wool ones don't have any special waterproofing, but they are double-layered, so there were no leaks, and they absorbed sweat around the waist, making them gentle on the skin. The cotton ones seem to have slightly weakened waterproofing.