On trademe, i believe they are the type of bindings that accept plastic mountaineering boots or the like. Ive got a similar pair and will be doing some ski mountaineering/ ice approaches with them on ruapehu this winter. Recommended! not the best price ever but with the skins its not a bad deal. In Welly too. Il need a partner!

http://www.trademe.co.nz/Browse/Listing.aspx?id=293929110