Samphire by Petasil is a fun, seasonal, washable group of leather sandals that is part of the Petasil range, also produced in Portugal, but with a distinctive feel and look designed to be practical yet fabulous.
They are made out of a specially developed leather that is designed to cope with getting wet and drying out; they are machine washable and resilient to most things the outside can throw at them.
Samphire sandals are machine washable.
Put inside an old pillowcase to protect your machine, and wash at 30 degrees with no detergent. Allow them to dry naturally away from direct heat (no balancing on radiators!). If you have no time for this then a wipe over with a damp cloth will tidy them up, and a coat of ordinary shoe polish for the leather finish, or a patent spray for the patent finishes.