Hyperflex AMP 3mm Split Toe Boot, 9 - Surfing, Windsurfing & Wakeboarding neoprene SUPERIOR PERFORMANCE: Diamond Skin Sole provides excellent traction and protection offering surfers a high performing boot. WARMTH: Designed to keep your feet warmer while remaining lightweight and comfortable. NEW DESIGN: This new and updated sleek design give surfers a better fit and finish than ever before. SURF BOOT: Hydro rib sole for excellent traction and improved durability. NEW TECHNOLOGY: The ExoShell+ Membrane gives a vulcanized heel lock membrane structure that connects to the upper arch strap for maximum adjustability, fit and support.