Manufactured from a revolutionary new material called T-Form, a super-soft silicon-based material, Tech 2s provide unsurpassed comfort with a unique look. They have asymmetric blades (meaning there is a specific right and left foot fin), but remember, they DO NOT float! The T2 fins are designed not only to flex laterally but also to TWIST during both Up and DOWN kick � emulating several sea animals' evolutionary aquatic propulsion methods. Those who know how to kick will benefit greatly from T2 and keeping their feet submerged will generate enough power for bodyboarding and bodysurfing in any surf conditions. Swimfin Weight: 3.2 lb per pair Note: These run about 1/2 size small. S M ML L XL 6-7 8-9 9-10 10-11 12-13