La Sportiva says:
Designed for touring and ski mountaineering objectives, the Solar is versatile, lightweight, and provides excellent range of motion, making it ideal for demanding uphill and downhill use. Featuring the new Swing-Lock Closure system, and the EZ Flex Overlap Tongue for a personalized fit, this boot can handle any type of terrain.
Current Retail: $699.00
Historic Range: $559.20-$699.00