The elevation and lengh given on the website can mistrust you. Snow shoieng is more demanding than simply walking
As an advice, choose first gentle hike and increase your hike on the folowings days. Anyway, during ours shoes hikes the guide will adapt the Pace to your fitness level
Prepare yourself as is you were planning a cross country session.
Not too hot but ready to hike outside in winter, don’t forget hat,gloves,glasses and solar cream