Racing a 300 lb sled made of concrete down a snow covered hill? Leave it to Canadian engineering students to make it reality! The Greater Northern Concrete Toboggan Race (GNCTR), a Canadian tradition where hundreds of engineering students build and race concrete toboggans, recently concluded its 38th year in Calgary, Alberta. Further to being a title sponsor for the event, Holcim Canada challenged students to build their toboggans in a sustainable manner by offering the Holcim Canada Sustainable Concrete Toboggan Prize. The entries were evaluated by looking at criteria such as the use of recycled materials, sourcing local materials, after use of the sled and more. Ryerson University won the main race as well as Holcim Canada's prize for building the most sustainable concrete toboggan.