The Taiss is a B2 boot which weighs as much as an approach shoe at 510g! Still very rigid with lots of toe protection and memory foam around the ankle. Stretch Gore-Tex fabric on the tongue to make it easy to get your foot in. Ideal for fast and light Alpine ascents. The Magic is also B2 workhorse boot designed for gnarly Scottish walk-ins. Memory foam in the tongue. Base Fit technology which attaches around the back of the boot to the laces and keeps your heel in place. ISO rate down to minus 25 degrees.