Skibobbing is a fun winter sport that combines elements of skiing and biking. It is a thrilling activity that can be enjoyed by all ages. Skibobbing involves riding a specially designed skibob, which is a combination of a ski and a bicycle
From Wikipedia
Skibob is a winter sport involving a bicycle-type frame attached to skis instead of wheels and sometimes a set of foot skis. The use of foot skis is what defines "skibob".