Bum Bags Brown What Is Zip System Sheathing Made Of at Erica Ferguson blog. brown grained calf leather stitched panels rail embossed strap knotted detailing zip closure Although it is new and unworn, due to the specialised recovery and tanning process that Lemaire uses for its leather goods, the texture of this piece will display signs of the material's natural grain, softness and creases. Colour: Brown Composition: Calf Leather: 100. 0% Country Of Manufacture: Spain MPN: BG0171LL0137BR490