A630 Rubber Backless Loafers

Birkenstock's black A630 loafers are made from waterproof rubber that has a durable oil and grease-resistant finish, then set on a non-slip tread sole.

• Polyurethane

With its famously comfortable soft cork footbed, the 250-year old Birkenstock brand is enjoying a new wave of popularity, with its Boston suede clogs, Madrid and Arizona sandals stealing the spotlight thanks to cosy shearling and big buckle iterations.