Black Sporty Matelass Nappa Leather Sandals Miu Miu Matelass nappa leather Sandals Sandals For Women Miu Miu How To Care For Nappa Leather Shoes at Debra Masters blog. Miu Miu's matelass nappa leather Sandals are distinguished by the matelass work that gives a three dimensional effect to the upper. The design is embellished with metal lettering, while the leather sole and banded leather heel complete the model with elegance and attention to detail.