3mm Titanium Hydro+ Beach Boot. TILOS Quality. 3mm Nylon II thickness for warmth. Lightweight and Rugged. Heavy Duty Rubber sole. Excellent traction. b3703. Crescent High Sole Design Provides Superior Arch and Heel Support These 3mm Low Cut Titanium Beach Booties are perfect for scuba diving, snorkeling, beach dives, walking through tidal pools, and much more!