<http://schema.org/weight>
"305 grams (11 oz)"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.newbalance.com/pd/new-balance-577/WW577.html?dwvar_WW577_color=White&cgid=26000&prefn1=itemType&start=9&prefv1=Cushioning>