Croozer Designs was originally spear-headed and designed for the European market by "Zwei+Zwei," (translates to "Two+Two") a German company specializing in tandems and bike trailers. Croozer is known for their low cost, versatile bike trailers which transform into strollers and jogging strollers. The Croozer line seems especially tough, due to a frame of both sturdy steel (but heavy) and lightweight aluminum. Z+Z tells us the European market demands that bike trailers be capable of daily use as a family-vehicle alternative over many years. Our close inspection of the Croozer products confirm a solid build, a smart design and very good quality. (Storewide 10% off sale does not apply to Croozer.).