Churchill Makapuu Fins (Blue/Yellow) - Size: Medium/Large (M/L) - Perfect for catching waves, whether bodyboarding, swimming, travel fins, bodysurfing, casual swimmers or tight space snorkeling ect. Perfect for catching waves, whether bodyboarding, swimming the surf, travel fins, bodysurfing, casual swimmers or tight space snorkeling ect. Optimum Power And Acceleration with Patented Dolphin Arc Design Greater Foot Comfort With Soft Rubber Covering yet still Stiff rubber blade for more kick power Mens Shoe Size Small (5-6.5) Medium (7-8.5) ML (9-10.5) Large (11-12.5) XL (13-14.5) Womens Shoe Size Small (6.5-8) Medium (8.5-10) ML (11-12) Large (12.5-14) XL (15-16)