I messed up on the size of my cockpit when I made my strip boat. A standard large skirt would pop off with any movement. I noticed an add in November/December Paddler magazine about a company that makes custom skirts. I traced the opening ,gave the depth of the coaming, and my seating location. The skirt cost $110.00 plus S&H. I did not receive it yet but they seem to be nice folks. They can be reached at Take It Outside, www.sealsskirts.com Toll Free 1-877-IT SEALS.