I took a punt on a pair of Breithorn Pro’s 5 years ago for hillwalking in the Peak. Only tend to wear them in the winter months or in slop as prefer non-membrane approach shoe style when I can. Still holding up strong with no workmanship issues. I rate them. Very well made, on a par with my wife’s Hanwag boots. Bestard aren’t a SP own brand (family business in Mallorca) – they just don’t seem to have much of a UK presence. They have their own website so you could check there on C1 crampon suitability or email them.