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. Size: Medium/Large (ML) Perfect for catching waves, whether bodyboarding (good for both dropknee and prone styles), swimming the surf, travel fins, bodysurfing, casual swimmers or tight space snorkeling ect. Excellent drainage system, sand grit is no longer an issue Optimum Power And Acceleration with Patented Dolphin Arc Design. Greater Foot Comfort (No more foot cramps in arches) 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)