Looking to have your best Birkie ever? Check TorbjornSport's SOLDA wax recommendation:
http://www.torbjornsport.com/SOLDA/racewax.php
SOLDA HPO5 wax was used by the top three men and the top two women in the 2005 American Birkie.
The current FIS Marathon Cup leader Christina Paluselli of Italy is exclusively racing on SOLDA Glide Wax.