Rollerskiing & Aerobic Efficiency?

A recent SkiPost article "Should I Rollerski?"  stated that "Rollerskiing is not the most efficient aerobic training out there," and recommended running, ski walking, and bounding for distance and intensity. What do you mean by "aerobic efficiency?"  I'm able to get my heart rate as high or higher with rollerskiing than running, at least on skate skis with decent snow-like resistance. R B

The short answer is that due to the limitations of rollerskis in their wheels, breaks, control and skier command combined with the limitations of most uncontrolled and often random terrain, rollerskiing is not the best activity to reliably peg your heart at a specific level for exacting amounts of time. This is sometimes also difficult, based on snow speed, grooming and terrain on skis as well. We will get you a more detailed answer and history or how rollerskiing is incorporated and who is doing what next week.

Soft Ground Ski Fit? 

Ok you answered my Salomon binding question, now a Salomon ski fit question. How come Salomon suggests the same general ski flex for its Softground (skate) ski as it does its cold ski or warm (skate) skis?  I always thought you fit skis for soft snow softer?  B. N.

Ah yes, Salomon recommends that ias a general fit its Equipe 10 skate skis midflex be at 1/2 a skier's KG body weight + 25KG  +- 5kg. This also holds true to the SoftGround because its engineering makes it ideal for soft snow so your fit does not need to make compensations. Salomon states that this extra long but noodle like pressure distribution mated to a normal midflex is one key reason why skiers have found it so fast in a multitude of track conditions and not just pure powder. 

(Read last year's Salomon Birkie SoftGround success story here).   

Which Binding?

I just purchased some Salomon Slab Classic boots and they fit like slippers. But why does boot have two axles under foot while the Propulse binding has just one axis? 

The S-Lab Classic boots does in-fact retain two axles so that the boots can be used on Salomon Nordic System (SNS) equipe (race) bindings new and old including the top of the line Propulse. This way your new boots will work on your old skis & SNS bindings as well as your newest skis with Propulse bindings. SNS compatibility chart