Took Roux out to test the glide wax, a layer of Rex G21 spray wax on top of a layer of good ol' Rex blue. Felt OK, though about half of what we skijored was 5 cm of ungroomed snow that fell over the past few days. It definitely felt fast in the tracks, which is what matters, since the virtual Birkie will be classic. Tomorrow, I'll do the kick wax test.