Active Birki Garden Clogs. The Active Birki Garden Clog is different from most clogs with an extremely durable dual-material polyurethane-rubber construction. Certified Slip-resistant by the Germany testing authority TUV, the Active Birki is ideal for a variety of tasks around garden, garage, kitchen and other technical environments. The Active Birki features a removable, replaceable cork footbed that forms naturally to the contours of your foot, providing stability and support, while increasing blood circulation. Made in Germany, the Active Birki Garden Clog can be washed at up to 140 degreesF. Available in both Regular and Narrow sizes.