Quicksilver flip flops – £4.99 at Decathlon (free C&C) + Others from £1.59

Stability Plastic straps providing minimal foot support.
Quick drying Drying time: 5 min. Conducted in laboratory conditions at 35°C.
Reduced chafing Between toes and straps made of flexible plastic.
Durability Resistance to wear, bending of the sole and tearing of the upper.