Our FINA-approved Endurance®+ High Waisted Jammer is designed and made for young swimmers. Our FINA-approved Endurance®+ High Waisted Jammer is designed and made for young swimmers. Built for competing, its low profile flat lock seams reduce irritation, and its 4-way stretch fabric ensures comfort, allowing you to focus on your race. The unique bold print means you\'ll stand out on the blocks. It’s designed to last and withstand everything your race day swim sessions throw at it.