The lightest and most agile crampon-compatible mountaineering boot available. The light weight, agile upper, and high-tech materials make it the perfect boot for light mountaineering on technical routes. The perfect choice for mountain guides and rescue groups. While we are happy to extend Salewa's No Blister guarantee to our in-store customers, due to the requirement for a proper fit at the beginning of the wear period, we are unable to extend the Blister Free Guarantee to our online customers. To quote Salewa: With the right choice of socks, proper fit and lacing, and appropriate use of the footwear, SALEWA guarantees our footwear to be 100% Blister Free. Our normal return policy applies.