Loaded with technology, but in a timeless package. The Caspian utilizes classic eS design language and simplifies things down to make a classic looking vulcanized shoe. But don’t be fooled by the clean exterior. Internally this shoe is packed with features to keep you skating all day. Double Wrap Vulcanized Construction. STI Energy Foam Insole. 400 NBS Rubber Outsole. Reinforced Vamp for Durability. Rubber Toe Bumper and Heel Reinforcement.