The Silver Surfboard.

There is always a hidden item in the clothing catalogs. Aunt Artic told me that there is always a viking helmet in it. In the sports catalog, I know how to unlock the silver surfboard!
1:click on the surfboard the penguin is holding
2:click on the starfish on the ground
3:click on the clamshell
The silver surfboard should know be with the penguin. Oh and there is another step to it.
4:buy the silver surfboard!!
Hehehehe.