<http://schema.org/weight>
"345 grams (12.2 oz)"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.newbalance.com/pd/new-balance-759/WW759.html?cgid=40057&prefn1=sizeRefinement2&prefn2=productClass&dwvar_WW759_color=Grey&start=11&prefv1=women_shoes_12&prefv2=Shoes>