- Black monk strap derbies for men - Upper: smooth leather, leather lining, leather insole - Elastomer lugged outsoles - Round toe, low shaft - Buckle fastening - Shaft height: 7 cm - Heel height: 3.5 cm The buckles? They're the hallmark of these men's derbies. Wear them off-centre with straight-leg jeans, an overshirt and a parka.