at the end of the bike racing season, i was looking for a fat bike. they used to call them snow bikes, because they were invented for rising in snow, but it turns out they're good for a lot more than that, so they just call them fat bikes now.
the reason i was looking for one is because on days when i don't ski and don't build snohaus, it would be nice to have the opportunity to go biking, and where i live they actually maintain winter trails for that, but you need a fat bike because snow.
the idea is that its very wide (4.5 inches) and low pressure tires function like snowshoes and just go through everything.
a guy i know sold me a nice second hand one, low mileage, good price.