Flexible Strobel Construction. Waterproof Leather, Synthetic, Suede or Mesh Upper. Marine Guard Toe and Heel Reinforced Protection. Breathable Mesh Lining. Removable Anatomical EVA Footbed. Nylon Arch Shank. Sebago Blue Wave Vibration Dampening Technology. Cushioned EVA Midsole. Sebago Energy Return Pad. Sebago TriWater Sport Sole with Slip-resistant, Non-marking Rubber.