Exterior: Fluid Foam Interior ,Fluid Foam Features: Torsion Control Forefoot Glued and Blindstiched Seams Top Shin Strap: Anti-Flush Split Toe (ST),Durable Textured Rubber Sole From the very first surf boot Jack built in the 1960's to the patented SuperFreak of the 90's (US Patent No. 5,913,592) O'Neill has always put their best foot forward when it comes to innovative boot invention and design. This season's newly designed boot program is the optimum in quality, fit and functionality. All the best materials combined with the latest in construction methods, hand built to perfection with the utmost attention to every detail. O'Neill has put these things to the test, climbing over barnacles and barbed wire fences on the way out to nameless cold water reefs and point breaks. Don't let punishing cold and rugged terrain keep you from the barrel of a lifetime. O'Neill boots, It's always Summer on the inside.