This new model features the best of both worlds - the S1 Shape combined with our Super Soft construction. The Stealth S1 is crafted with 100% Malaysian rubber. It has a soft foot pocket for ultimate comfort and a stiff curved blade for maximum propulsion. It is built with the classic circle drainage system and has been used by many top riders over the years. S1 Features: Crafted with 100% Malaysian Rubber (the best!). Soft asymmetrical foot pocket to produce a perfect fit. Stiff curved blade for maximum propulsion and minimal effort. Blade rail ridges and angled rails to transfer energy easily and efficiently. Classic circle drainage system to keep the foot pocket free from sand and rocks. Recent updates: Circle drainage hole reduced Slightly softer durometer Premium quality rubber as per S2's