Scarpa Cristallo GTX Mountain Elite Ladies Boots The Scarpa Cristallo GTX Mountain Elite Boots are ideal for those technical scrambling terrains & Via Ferrata routes. The Cristallo GTX are ultra lightweight & comfortable- with a high cut ankle for great support. The Scarpa Cristallo GTX Boots were intended to replace the awesome Pro-Ascent Boots & based on the performance of these Mountain Elite Boots- the Scarpa Cristallo GTX is definitely more than a match for its predecessor.