The Invitational is the world 's longest winter ultra-marathon by mountain bike , foot and skis .
Ripmaster completed another hard - to - believe - he 's - human feat when he placed third in the epic Iditarod Trail Invitational 350 earlier this month .
The Iditarod Trail Invitational is the world 's longest winter ultra-marathon by mountain bike , foot and skis .
Ripmaster completed another hard - to - believe - he 's - human feat when he placed third in the epic Iditarod Trail Invitational 350 earlier this month .