Did you post the wrong photo? I searched Yoox, and couldn't find anything close to them. The photo you posted is from Ssense (http://www.ssense.com/men/product/balmain/black_waxed_biker_jeans/92414) which lists them as black waxed biker jeans. They seem to be the same as (http://www.matchesfashion.com/product/190638), (http://www.mientus.com/en/balmain-twisted-leg-waxed-jeans.html) and (http://www.luisaviaroma.com/index.aspx?#ItemSrv.ashx|SeasonId=59I&CollectionId=M09&ItemId=34&VendorColorId=MTc2&SeasonMemoCode=actual&GenderMemoCode=men&Language=&CountryId=&SubLineMemoCode=&CategoryId=0&ItemResponse=&MenuResponse=&SizeChart=false&ItemTag=true&NoContext=false)
Just curious as I have been looking for thinner waxed cotton pants for the hot summer, but these all appear to be the same jeans. Maybe lighting is causing the color difference in the zippers.