What did Francois make for Buck to help him with his feet in the wild, cold land?

Francois made Buck moccasins.

All day long he limped in agony, and camp once made, lay down like a dead dog. Hungry as he was, he would not move to receive his ration of fish, which Francois had to bring to him. Also, the dog-driver rubbed Buck's feet for half an hour each night after supper, and sacrificed the tops of his own moccasins to make four moccasins for Buck. This was a great relief, and Buck caused even the weazened face of Perrault to twist itself into a grin one morning, when Francois forgot the moccasins and Buck lay on his back, his four feet waving appealingly in the air, and refused to budge without them. later his feet grew hard to the trail, and the worn-out footgear was thrown away.