Blacco Neck Ring Material: 2mm, Outer fabric (jersey), Inner fabric (SCS) Height (width) 9.5cm Width (when laid flat) 13.5cm Stretchy There are creases as it was used folded for a drysuit. I used it with a neck size of 30cm, but it was tight, so it's recommended for those with a neck size of 30cm or less. For those who find the neck area of off-the-rack wetsuits a little loose, you can adjust it by wearing the neck ring inside. Please understand that this item has been stored at home before purchasing.