1.   But in the end, the sport depends on the marriage of the fiberglass sled and its metal runners with the ice of the labyrinthine tunnel.

2.   Mushing is a sport that involves a team of dogs pulling a special wooden or fiberglass sled for long distances through snow and ice.

3.   The American skeleton racers keep their fiberglass sleds in their rooms to safeguard them from accident or sabotage.

4.   The men will use specially designed plastic sleds that are lighter than the more commonly used fiberglass sleds, and the wooden sleds used by Scott.