IMPORTANT: FOR YOUTH SIZE 11-13 (BLUE/RED), PLEASE SELECT VARIANT "CHILD 11-1" The Tritan Swim Fins – Training Fins for Power & Technique are designed to strengthen legs and improve kicking form. Lightweight yet durable, they support swimmers of all levels. Short blade design enhances technique and cadence Soft, comfortable foot pocket reduces fatigue Durable construction for repeated training use Improves ankle flexibility and leg strength Suitable for competitive and fitness swimmers Boost kick performance with Tritan Swim Fins. Size 6-8C 8-11C 11-1C 1-3 3-5 5-7 7-9 9-10 10-11 11-13 Youth Shoe Size 6-8 8-11 11-1 Women's Shoe Size 3-5 5-7 7-9 9-10 10-11 11-12 13-15 Men's Shoe Size 1-3 3-5 5-7 7-9 9-10 10-11 11-13 Foot Pockets 7.3" 7.7" 8.1" 8.6" 9" 9.3" 9.8" 10.2" 10.6" 10.9" Fin Width 5.5" 6" 6.25" 6.5" 6.875" 7.25" 7.375" 7.875" 8" 8.375" Full Fin Length (Tip to Heel) 12.5" 13.5" 14" 14.75" 15.5" 16" 16.785" 17.875" 18.25" 19"